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Journal of Neuroscience, Vol 10, 952-974, Copyright © 1990 by Society for Neuroscience
The organization and connections of somatosensory cortex in marmosets
LA Krubitzer and JH Kaas
Department of Psychology, Vanderbilt University, Nashville, Tennessee 37240.
Microelectrode mapping methods were used to define and describe 3
representations of the body surface in somatosensory cortex of marmosets:
S-I proper or area 3b of anterior parietal cortex, S-II, and the parietal
ventral area (PV) of the upper bank of the lateral sulcus. In the same
animals, injections of anatomical tracers were placed into
electrophysiologically determined sites in area 3b or S-II. Mapping results
and patterns of connections were later related to architectonic fields that
were delimited in sections cut parallel to the surface of manually
flattened cortex and stained for myelin. There were several major results.
(1) Recordings from area 3b revealed a characteristic somatotopic
organization of foot to face in a mediolateral sequence as previously
reported in other members of the marmoset family (Carlson et al., 1986).
(2) Multiple injections of WGA-HRP in area 3b demonstrated dense, patchy
interconnections with ipsilateral S-II, PV, area 3a, and area 1, less dense
interconnections with primary motor cortex (M-I), the supplementary motor
area (SMA), limbic cortex of the medial wall (L), and rostrolateral
parietal cortex of the lateral sulcus (PR), and callosal connections with
areas 3b, S-II, and PV. Injections of 3 different tracers into the
representation of 3 body regions in area 3b indicated that the connections
with areas 3a, 3b, 1, S-II, and PV are topographically organized. (3)
Recordings from cortex on the upper bank of the lateral sulcus demonstrated
a somatotopic representation of the body surface that matches that of S-II
of other mammals. S-II immediately adjoined areas 3b along the dorsal lip
of the lateral sulcus. The face representation in S-II was adjacent to the
face representation in 3b while the trunk, hindlimb, and forelimb were
represented in a caudorostral sequence deeper in the sulcus. (4) Injections
in S-II revealed ipsilateral connections with areas 3a, 3b, 1, a
presumptive area 2, PV, PR, M-I, SMA, limbic cortex, the frontal eye
fields, and the frontal ventral visual area. Dense callosal connections
were with S-II and PV. (5) The recordings also revealed a systematic
representation just rostral to S-II that has not been previously described
in primates.(ABSTRACT TRUNCATED AT 400 WORDS)
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