ISSN:
1432-0878
Keywords:
Flatworm
;
Nerve-net
;
Epithelium
;
Ultrastructure
;
Synapse
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary In addition to a submuscular and subepithelial nerve plexus an infra-epithelial nerve-net also occurs in Notoplana acticola. It contains naked nerve cells which lie between the bases of epithelial cells. Individual neurites occur separately or in small tracts. Synapses contain clear spherical vesicles and are polarized. Post-synaptic neurites tend to be flat and ribbon-like. Rhabdite and mucus secreting cells in the epithelium have synapses associated with them. Neurites ending on the rhabdites appear to originate in the subepithelial plexus. The “sensory-free nerve endings” of earlier workers are reinterpreted as being motor terminals on epithelial secretory cells.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00221792
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