Cytoarchitecture and responsiveness of the medial ansate region of the cat primary somatosensory cortexстатья
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Аннотация:To understand its relationship to somatosensory areas in other species, we studied the
rostra1 bank of the medial ansate sulcus in adult cats. Neurons in the shoulder and upper part of
the sulcal wall responded to low-threshold cutaneous stimuli much like neurons on the crown of
the gyrus, whereas neurons in some deeper portions of the sulcus required more intense but
innocuous somatic stimuli. Because we found much of the body surface re-represented in this
area, we suggest that, besides the representation in area 3b, there is another cutaneous
representation of the hindlimb and trunk located on the gyral crown near the medial end of the
medial ansate sulcus and of the forelimb and trunk within the medial ansate sulcus. Posterior
to this second cutaneous representation, many parts of the body were also represented in
regions activated by more intense stimuli and having a different cytoarchitecture, suggesting
that they were part of another body representation.
Area 3b and the shoulder of the gyrus were distinguished by relatively intense acetylcholinesterase
staining of layers I11 and IV. In the wall of the sulcus, all layers except layer I were
uniformly stained to a point where electrophysiological recordings showed the cortex to be
unresponsive, whereupon the outer two-thirds of layer I became very pale. Neurons activated
by afferents from knee joints were found only in a small area; we did not find a mediolateral
band serving joint afferents as is reported in primates. These data suggest that cat somatosensory
cortex differs in some ways from primates but that it contains multiple representations of
the body, as do most other mammals.