In:
Visual Neuroscience, Cambridge University Press (CUP), Vol. 18, No. 1 ( 2001-01), p. 25-41
Abstract:
Based on cytoarchitectonic criteria, the primate pulvinar
nucleus has been subdivided into medial (PM), lateral (PL), and inferior (PI) regions. However, these subdivisions
show no correlation with those established by electrophysiological, immunocytochemical, or neuroanatomical tracer studies.
In this work, we studied the connections of the pulvinar nucleus of Cebus monkey with visual areas V1,
V2, V4, MT, and PO by means of retrograde fluorescent tracers injected into these areas. Based on the projection zones
to cortical visual areas, the visual portion of the pulvinar of Cebus monkey was subdivided into three subregions:
P1, P2, and P3, similar to those described in the macaque (Ungerleider et al., 1984). In Cebus , P1 includes
the centrolateral portion of traditionally defined PI and adjacent portion of PL. P2 is located in the dorsal portion
of PL and P3 includes the medial portion of PI and extends dorsally into adjacent PL and PM. In addition, we studied
the histology of the pulvinar using multiple criteria, such as cytoarchitecture and myeloarchitecture; histochemistry
for cytochrome oxidase, NADPH-diaphorase, and acetylcholinesterase; and immunocytochemistry for two calcium-binding proteins,
calbindin and parvalbumin, and for a neurofilament recognized by the SMI-32 antibody. Some of these stains, mainly calbindin,
showed additional subdivisions of the Cebus pulvinar,
beyond the traditional PI, PL, and PM. Based on this immunohistochemical staining, the border of PI is moved dorsally above the
brachium of the superior colliculus and PI can be subdivided in five regions (PI P , PI M , PI C ,
PI L , and PI LS ). Regions P1, P2, and
P3 defined based on efferent connections with cortical visual areas are not architectonically/neurochemically
homogeneous. Rather they appear to consist of further chemoarchitectonic subdivisions. These distinct histochemical regions might
be related to different functional modules of visual processing within one connectional area.
Type of Medium:
Online Resource
ISSN:
0952-5238
,
1469-8714
DOI:
10.1017/S0952523801181034
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2001
detail.hit.zdb_id:
1489922-X
SSG:
12
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