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  • 1
    Online Resource
    Online Resource
    New York, NY :Springer,
    Keywords: Animal Physiology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (1243 pages)
    Edition: 1st ed.
    ISBN: 9781493929818
    Series Statement: Advances in Experimental Medicine and Biology Series ; v.875
    DDC: 578.76
    Language: English
    Note: Intro -- Copyright -- Preface -- Acknowledgments -- Contents -- Chapter 1: Noise-Induced Hearing Loss: Permanent Versus Temporary Threshold Shifts and the Effects of Hair Cell Versus Neuronal Degeneration -- 1 Measuring Noise-Induced Hearing Loss -- 2 Permanent Hair Cell Damage and Noise-Induced Threshold Elevation -- 3 Permanent Neural Damage after Temporary Threshold Shift -- 4 Noise-Induced Neuropathy and Hidden Hearing Loss -- References -- Chapter 2: Modeled and Measured Underwater Sound Isopleths and Implications for Marine Mammal Mitigation in Alaska -- 1 Introduction -- 2 Data Compilation of Modeled and Measured Sound Isopleths -- 3 Results of Sound Isopleth Comparisons -- 4 Discussion -- References -- Chapter 3: Peer-Reviewed Studies on the Effects of Anthropogenic Noise on Marine Invertebrates: From Scallop Larvae to Giant Squid -- 1 Introduction -- 2 Summary of Peer-Reviewed Papers on the Effects of Noise on Invertebrates -- 2.1 Aguilar de Soto et al. (2014) Scientific Reports -- 2.2 André et al. (2011) Frontiers in Ecology and the Environment and Solé et al. (2012) Deep-Sea Research Part II-Topical Studies in Oceanography -- 2.3 Andriguetto-Filho et al. (2005) Continental Shelf Research -- 2.4 Branscomb and Rittschof (1984) Journal of Experimental Marine Biology and Ecology -- 2.5 Fewtrell and McCauley (2012) Marine Pollution Bulletin -- 2.6 Guerra et al. (2011) Biological Conservation -- 2.7 Lagardère (1982) Marine Biology and Regnault and Lagardère (1983) Marine Ecology Progress Series -- 2.8 Parry and Gason (2006) Fisheries Research -- 2.9 Pearson et al. (1994) Marine Environmental Research -- 2.10 Wale et al. (2013a) Biology Letters and Wale et al. (2013b) Animal Behaviour -- References -- Chapter 4: Sources of Underwater Sound and Their Characterization -- 1 Introduction. , 2 Traditional Characterization of Underwater Sound Sources -- 2.1 Sonar -- 2.2 Ships -- 2.3 Air Guns -- 2.4 Explosives -- 2.5 Pile Drivers -- 3 Alternative Characterizations -- 4 Toward Standardization -- 4.1 Standardization of Terminology -- 4.2 Standardization of Measurement Procedures -- 5 Conclusions -- References -- Chapter 5: Assessment of Marine Mammal Impact Zones for Use of Military Sonar in the Baltic Sea -- 1 Introduction -- 2 Methods -- 2.1 Sound Propagation Modeling and Sound Source -- 2.2 Marine Mammals and Hearing -- 2.3 Thresholds for Reaction and Injury -- 3 Results -- 4 Discussion -- 4.1 Impact Zone for Behavioral Reactions -- 4.2 Impact Zone for Hearing Damage -- References -- Chapter 6: Contribution to the Understanding of Particle Motion Perception in Marine Invertebrates -- 1 Introduction -- 2 Methods -- 2.1 Controlled Exposure Experiment Conditions -- 2.2 Targets -- 2.3 Choice of Frequencies -- 2.4 Cuttlefish Body Response -- 3 Results -- 3.1 Frequency Response -- 3.2 Effect of Position on Measurements -- 3.3 Comparison of Dead to Alive Animals -- 3.4 Body Vibration -- 4 Discussion and Conclusions -- References -- Chapter 7: Functional Morphology and Symmetry in the Odontocete Ear Complex -- 1 Introduction -- 2 Materials and Methods -- 3 Results -- 4 Discussion -- 5 Conclusions -- References -- Chapter 8: A Low-Cost Open-Source Acoustic Recorder for Bioacoustics Research -- 1 Introduction -- 2 Design of Underwater Sound Recorders -- 2.1 Self-Noise -- 2.2 Calibration and Characterization -- 2.3 Metadata -- 2.4 Packaging -- 3 Conclusions -- References -- Chapter 9: Assessment of Impulsive and Continuous Low-­Frequency Noise in Irish Waters -- 1 Introduction -- 2 Methods -- 2.1 Analysis of Seismic Surveys -- 2.2 Vessel Density -- 2.3 Cetacean Distribution -- 3 Results -- 3.1 Analysis of Seismic Surveys -- 3.2 Vessel Density. , 3.3 Cetacean Distribution -- 4 Discussion -- References -- Chapter 10: Is the Venice Lagoon Noisy? First Passive Listening Monitoring of the Venice Lagoon: Possible Effects on the Typical Fish Community -- 1 Introduction -- 2 Materials and Methods -- 3 Results -- 4 Discussion -- References -- Chapter 11: Effect of Pile-Driving Sounds on the Survival of Larval Fish -- 1 Introduction -- 2 Materials and Methods -- 2.1 Larvaebrator -- 2.2 Pile-Driving Sounds -- 2.3 Fish Larvae -- 2.4 Experimental Design -- 2.5 Statistical Analysis -- 3 Results -- 4 Discussion -- References -- Chapter 12: Challenge of Using Passive Acoustic Monitoring in High-Energy Environments: UK Tidal Environments and Other Case Studies -- 1 Introduction -- 2 Methods -- 2.1 Data Analysis -- 3 Results -- 3.1 Effect of Noisy Environments -- 4 Discussion -- References -- Chapter 13: Hearing Mechanisms and Noise Metrics Related to Auditory Masking in Bottlenose Dolphins (Tursiops truncatus) -- 1 Introduction -- 1.1 Critical Ratios and Critical Bands -- 1.2 Comodulation Masking Release -- 1.3 Study Goals -- 2 Participants -- 2.1 Behavioral Hearing Tests -- 2.2 Noise Metrics -- 2.3 Statistical Models -- 3 Results -- 4 Discussion -- References -- Chapter 14: Effects of Hatchery Rearing on the Structure and Function of Salmonid Mechanosensory Systems -- 1 Introduction -- 2 Effects of Hatchery Rearing on the Lateral Line -- 3 Effects of Noise Exposure in the Hatchery -- 3.1 Effects on Hearing -- 3.2 Hatchery Noise and Stress -- 4 Future Directions -- References -- Chapter 15: Effects of Impulsive Pile-Driving Exposure on Fishes -- 1 Introduction -- 1.1 The Regulatory Issue -- 2 Experimental Approach -- 3 Overview of Results -- 3.1 Effects on Juvenile Chinook Salmon -- 3.2 Recovery in Juvenile Chinook Salmon -- 3.3 Effects on Other Species -- 3.4 Effects on Fishes of Different Sizes. , 3.5 Effects on Inner Ear Tissues -- 4 Conclusions on the Effects of Pile-Driving Exposure on Fishes -- References -- Chapter 16: Review of the Effects of Offshore Seismic Surveys in Cetaceans: Are Mass Strandings a Possibility? -- 1 Introduction -- 2 Materials and Methods -- 2.1 Behavioral Effects -- 2.2 Mass Strandings -- 3 Results -- 3.1 Behavioral Effects -- 3.2 Mass Strandings -- 4 Discussion -- 4.1 Behavioral Effects -- 4.2 Mass Strandings -- 5 Conclusions -- References -- Chapter 17: Addressing Challenges in Studies of Behavioral Responses of Whales to Noise -- 1 Introduction -- 2 Experimental Design -- 3 Field Measurements -- 3.1 Measurement of Behavior -- 3.2 Measurement of Received Noise Levels and the Acoustics of the Site -- 4 Analysis and Results -- 5 Conclusions -- References -- Chapter 18: Measurements of Operational Wind Turbine Noise in UK Waters -- 1 Introduction -- 2 Materials and Methods -- 2.1 Wind Farms Surveyed -- 2.2 Measurement Methods -- 2.3 Measurement Equipment -- 2.4 Data Analysis -- 3 Results -- 4 Discussion -- 5 Conclusions -- References -- Chapter 19: A Bioenergetics Approach to Understanding the Population Consequences of Disturbance: Elephant Seals as a Model System -- 1 Introduction -- 2 Materials and Methods -- 2.1 Disturbance -- 2.2 Life History Data and Analysis -- 3 Results -- 3.1 Movements Through Disturbance -- 3.2 Relating Disturbance to Reproduction and Pup Survival -- 3.3 Comparison to California Sea Lions -- 4 Discussion and Conclusions -- References -- Chapter 20: Singing Fish in an Ocean of Noise: Effects of Boat Noise on the Plainfin Midshipman (Porichthys notatus) in a Natural Ecosystem -- 1 Introduction -- 1.1 Fish and Ships -- 1.2 Predators and Prey -- 1.3 A Singing Fish -- 2 Study -- 2.1 Methods -- 3 Preliminary Findings -- 4 Importance of Field Studies: Looking at the Ecosystem. , 5 Ongoing Work/Future Studies -- References -- Chapter 21: Detection of Complex Sounds in Quiet Conditions by Seals and Sea Lions -- 1 Introduction -- 2 Psychoacoustics -- 3 Results by Stimulus Type -- 3.1 FM Stimuli -- 3.2 AM Stimuli -- 3.3 Harmonic Stimuli -- 4 Future Directions -- References -- Chapter 22: Offshore Dredger Sounds: Source Levels, Sound Maps, and Risk Assessment -- 1 Introduction -- 2 Ambient-Sound Measurements -- 3 TSHD Underwater Sound Measurements and Source Levels -- 4 Sound Maps -- 5 Risk Assessment -- References -- Chapter 23: Effects of Offshore Wind Farms on the Early Life Stages of Dicentrarchus labrax -- 1 Introduction -- 2 Objectives -- 3 Target Species -- 4 Work Packages -- 4.1 WP1 -- 4.2 WP2 -- 5 Output -- References -- Chapter 24: The European Marine Strategy: Noise Monitoring in European Marine Waters from 2014 -- 1 Introduction to the Marine Strategy Framework Directive -- 1.1 Overall Goal of the Marine Strategy Framework Directive -- 1.2 Implementation of the MSFD -- 1.3 The MSFD and Underwater Sound -- 1.4 Criteria and Methodological Standards -- 2 Monitoring of Impulsive Noise -- 2.1 Aim/Effect Addressed by Impulsive Noise Indicator -- 2.2 Description of Sound Sources to Be Registered, including Their Source Levels -- 3 Monitoring Guidance for Ambient Noise -- 3.1 Aim/Effect Addressed by Ambient-Noise Indicator -- 3.2 Advice on Measuring and Modeling -- 3.3 Averaging Method for Ambient Noise -- 3.4 Outline of the Monitoring Program -- 4 Main Results and Conclusions -- References -- Chapter 25: Potential Population Consequences of Active Sonar Disturbance in Atlantic Herring: Estimating the Maximum Risk -- 1 Introduction -- 2 Materials and Methods -- 3 Results and Discussion -- 3.1 Step 1 -- 3.2 Step 2 -- 3.3 Step 3 -- 3.4 Step 4 -- References. , Chapter 26: Fulfilling EU Laws to Ensure Marine Mammal Protection During Marine Renewable Construction Operations in Scotland.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 177 (1983), S. 301-317 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The relationship between the hair cell orientation pattern and innervation in the saccule and lagena of the teleost Helostoma temmincki (the kissing gourami) was investigated with scanning electron microscopy and the Winkelmann-Schmitt silver impregnation technique. The hair cell pattern in the saccule consists of four orthogonally oriented groups. The anterior two groups are oriented along the animal's rostrocaudal axis, and the posterior two are oriented along its dorsoventral axis. The pattern of hair cell orientations in the lagena is a typical bidirectional one. Two divisions of the eighth nerve innervate the saccule. The anterior division innervates the horizontally oriented hair cell groups, and the posterior division innervates the dorsoventrally oriented groups. A single nerve innervates the lagena, with the majority of fibers innervating one or the other of the two lagenar hair cell groups. The segregated pattern of innervation according to hair cell orientation groups in the saccule was confirmed in other species. Individual types of axonal terminations appear to innervate hair cells of specific ciliary bundle types.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 176 (1983), S. 121-129 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The inner ears of a few fishes in the teleost superorder Ostariophysi are structurally unlike those of most other teleosts. Scanning electron microscopy was used to determine if other ostariophysans share these unusual features. Examined were the families Cyprinidae, Characidae, and Gymnotidae (all of the series Otophysi), and Chanidae (of the sister series Anotophysi), representing the four major ostariophysan lineages, the auditory organs of which have not yet been well described. Among the Otophysi, the saccular and lagenar otolith organs are similar to those reported for other ostariophysans. The lagena is generally the larger of the two organs. The saccular sensory epithelium (macula) contains long ciliary bundles on the sensory hair cells in the caudal region, and short bundles in the rostral region. The saccule and the lagena each have hair cells organized into two groups having opposing directional orientations. In contrast, Chanos, the anotophysan, has a saccular otolith larger than the lagenar otolith, and ciliary bundles that are more uniform in size over most of its saccular macula. Most strikingly, its saccular macula has hair cells organized into groups oriented in four directions instead of two, in a pattern very similar to that in many nonostariophysan teleosts. We suggest that the bi-directional pattern seen consistently in the Otophysi is a derived development related to particular auditory capabilities of these species.
    Additional Material: 6 Ill.
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  • 4
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The morphology of the Weberian ossicles of Astyanax mexicanus, an eyed river fish, and A. jordani, the Mexican blind cave fish, was investigated and the results were correlated with behavioral data on the auditory capacities of the two species. Several characteristics of the ossicles of the two species were inter-specifically significantly different while other characteristics varied as much intra-specifically as inter-specifically. The ascending arm of the scaphium was shorter in the blind fish than in the river fish and the ascending arm of the intercalarium was further from the distal end of the base of the bones in the blind fish than in the river fish.A previously unreported ligament between the scaphium and the sinus atrium impar was found in Astyanax. It was hypothesized that this connective tissue retained perilymphatic fluid within the inner ear, helped the ossicles return to an anterior position after moving posteriorly, and might protect the inner ear during intense acoustical stimulation.
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 153 (1977), S. 397-417 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The ulstrastructure of the saccular and lagenar maculae were studied in 15 species of teleost fishes, using the scanning electron microscope. Particular attention was paid to hair cell orientation patterns, composition of the ciliary bundles on the hair cells, hair cell distributions, and supporting cell types. The hair cells on both otolithic organs are divided into several groups with all of the hair cells in each group oriented in the same direction. The posterior region of the saccular macula in all species had dorsally oriented hair cells on the dorsal half of the macula and ventrally oriented hair cells on the ventral half. The cells on the anterior end of the macula were oriented anteriorly and posteriorly, with the posterior group, in most species, being on the dorsal half of the anterior region of the macula. There was considerable inter-specific variation upon this basic pattern.Inter-specific variation on the lagenar macula was considerably less than on the saccular macula. The basic pattern in all of the species includes one dorsal cell group and one ventral cell group.There are four more-or-less discrete ciliary bundles, each varying in the relative size of the kinocilia and stereocilia. Intermediary forms were also observed, making it difficult to differentiate ciliary bundles in some instances. It was apparent, however, that several of the ciliary bundles were found in particular macular regions.
    Additional Material: 28 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 161 (1979), S. 241-256 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The ultrastructure of the sacculus and lagena of a moray eel, Gymnothorax sp., was investigated using scanning and transmission electron microscopy. Particular emphasis was placed on the orientation of the sensory hair cells and on the ultrastructure of the sensory cells. The ciliary bundles on the sensory hair cells are of several types, each having a different size relationship between the kinocilium and stereocilia. The cell bodies of the sensory cells are similar to the mammalian type II sensory cell. There were no apparent differences in the cell bodies between sensory cells with different ciliary bundles.Hair cell orientation patterns on the saccular and lagenar maculae differ from patterns found in other fishes. The posterior side of the saccular macula in Gymnothorax has cells oriented dorsally and ventrally, as is typical in other non-ostariophysan species. The anterior end of the saccular macula has alternating groups of anteriorly and posteriorly oriented cells, a situation that differs from the more typical pattern in which anteriorly oriented cells are found on the ventral side of the macula while posteriorly oriented cells cover the dorsal side of the macula. The orientation of cells on the lagena includes ventral cells that are located above a group of dorsally oriented cells. In many other non-ostariophysans, ventrally oriented cells are generally posterior to the dorsally oriented cells.
    Additional Material: 16 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 194 (1987), S. 323-348 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The development of the saccule of the inner ear in the toadfish was studied using light and scanning electron microscopy. Development was studied from the early embryo (2-3 days postfertilization), when the otocyst first forms, to the early-aged juvenile when the development of the inner ear approximates that of the adult (4 weeks postfertilization). The ultrastructural features examined included the morphological sequence of ciliary bundle growth, the development of orientation patterns of the ciliary bundles, and the relation of the ultrastructural development to overall gross development.Gross development may be divided into four distinct morphological stages. Stage I encompasses the time from initial formation of the otocyst until the start of stage II, which is the stage when the pars inferior begins migrating ventrally. In stage III the pars inferior continues to elongate ventrally. Stage IV starts when the pars inferior elongates in a rostral and caudal direction. The ear attains its adult shape in stage IV.The differentiation of the sensory cells begins during stage I. During the early part of stage I, a small cilium is found on the apical surface of each cell throughout the otocyst. In the middle and late periods of stage I, a few micro - villous buds add to the surface of the cells that already have a kinocilium. These early ciliary bundles are clustered on the rostral - ventral and caudal walls of the otocyst. There is no clear patterning to the orientation of these ciliary bundles. In stage II the ventral stretching of the labyrinth wall causes a spreading of the clustered bundles along the ventral and medial walls of the pars inferior. The orientation of the ciliary bundles has no distinct pattern. In stage III the orientations of the ciliary bundles appear adultlike, although there are so few ciliary bundles that it is difficult to make a definite determination. During stage IV, hair cells with an adultlike horizontal and vertical orientation pattern are found on the rostral and caudal sections of the saccular macula, respectively. The transition region lying between these areas has ciliary bundles with various orientations.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 198 (1988), S. 49-69 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The development of the sensory epithelium of the saccular macula of Opsanus tau was studied with transmission electron microscopy. In the 10-12 somite embryo all cells of the newly formed otocyst are morphologically undefined, having an apically placed cilium with an underlying basal body and parabasal body. Junctional complexes are characterized primarily by tight junctions and a few desmosomes. In the 17-somite embryo the sensory cells begin to differentiate and are definable by the development of microvilli, which lack a cuticular plate. When the embryo has approximately 25-30 somites, ganglion cells differentiate and send their nerve processes toward the thin, disrupted basal lamina and the developing rhombencephalon. Desmosomes are more definable in the sensory regions at this age.As the myotomes begin forming (approximately 5-8 days before hatching), the nerves invade the sensory epithelium, and the developing sensory cells contain dense bodies surrounded by clear, membrane-bound vesicles. Clear synapticlike vesicles are also found throughout the infranuclear region of the sensory cells. However, afferent fibers lack a postsynaptic density. Three to 6 days prior to hatching a cuticular plate begins forming under the ciliary bundles and support and peripheral cells begin to morphologically differentiate. Two to 4 days before hatching the cuticular plate is well formed, desmosomes are numerous, afferent synapses and complete, and the sensory cells are in the upper two-thirds of the epithelium. Seven to 10 days after hatching, sensory cells have efferent synapses and ganglion cells and nerves show a myelin coat. These results suggest that sensory cells begin their development prior to VIIth nerve innervation, although the orientation and pattern development of these cells may be related to the formation of the cuticular plate, desmosomes, afferent innervation, and basal lamina formation.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 194 (1987), S. 129-142 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The endorgans of the inner ear of the gar were examined using transmission and scanning electron microscopy as well as nerve staining. The ultrastructure of the sensory hair cells and supporting cells of the gar ear are similar to cells in other bony fishes, whereas there are significant differences between the gar and other bony fishes in the orientations patterns of the sensory hair cells on the saccular and lagenar sensory epithelia.The saccular sensory epithelium has two regions, a main region and a secondary region ventral to the main region. The ciliary bundles on the main region are divided into two groups, one oriented dorsally and the other ventrally. Furthermore, as a result of curvature of the saccular sensory epithelium, the dorsal and ventral ciliary bundles on the rostral portion of the epithelium are rotated ninety degrees and are thus oriented on the animal's rostro-caudal axis. Hair cells on the secondary region are generally oriented ventrally.The lagenar epithelium has three groups of sensory hair cells. The groups on the rostral and caudal ends of the macula are oriented dorsally, whereas the middle group is oriented ventrally. Hair cell orientations on the utricular epithelium and macula neglecta are similar to those in other bony fishes.Nerve fiber diameters can be divided into three size classes, 1-8 μm, 9-13 μm, and 14 μm or more, with the smallest size class containing the majority of fibers. The distribution of the various classes of fiber diameters is not the same in nerve branches to each of the end organs. Similarly, the ratio of hair cells to axons differs in each end organ. The highest hair cell to axon ratio is in the utricle (23:1) and the smallest is in the macula neglecta (7:1). The number of sensory hair cells far exceed the number of eighth nerve axons in all sensory epithelia.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 157 (1980), S. 115-136 
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The ultrastructure of the sacculus and lagena, two otolithic organs involved in audition, was studied in seven species of bathypelagic and mesopelagic fishes representing a taxonomically diverse sampling of Division-III teleost fishes. The saccular macula in each species had hair cells oriented in four directions, with cells on the rostral part of the macula oriented anteriorly and posteriorly, and those on the caudal end of the macula oriented dorsally and ventrally. The most significant variation from this pattern was in a Gadiform fish, Bregmaceros sp., which also had additional groups of horizontally oriented cells on the posterior end of the macula. The lagenar macula in each species had very similar hair cell orientation patterns, there being dorsally oriented cells on the anterior side of the macula and ventrally oriented cells on the posterior side. The only exception to this pattern was in Ectreposebastes, in which the two groups of cells were oriented towards one another.Significantly, the predominant ciliary bundles on the sensory hair cells of the saccular maculae, and to a slightly lesser degree on the lagenar maculae, were quite similar in almost all species. The bundles had a single long kinocilium and graded stereocilia, the longest of which were almost as long as the kinocilium. This pattern is far less frequently found in shallow water fishes.These data further demonstrate that the hair cells oriented in four directions on the saccular macula may be ubiquitous among all teleost fishes other than the Ostariophysi. The data also lead to the suggestion that the elongate ciliary bundle may be adaptive to certain features of life in deep water.
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