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Journal of Neuroscience, Vol 13, 534-546, Copyright © 1993 by Society for Neuroscience
Connections of visual areas of the upper temporal lobe of owl monkeys: the MT crescent and dorsal and ventral subdivisions of FST
JH Kaas and A Morel
Department of Psychology, Vanderbilt University, Nashville, Tennessee 37240.
An oval of cortex of moderately dense myelination just ventral to the
middle temporal visual area (MT) with input from MT has been referred to as
the fundal area of the superior temporal sulcus (FST). Injections of the
tracer WGA-HRP into dorsal (FSTD) and ventral (FSTv) halves of FST revealed
that only FSTD has connections with MT. FSTv has connections instead with
small patches of cortex that string together like beads to form a ring or
crescent (MTc) around most of MT. The patches in MTc stain densely for
myelin or cytochrome oxidase, and they are embedded in a less densely
stained matrix. The connections of FSTD associate the area with the dorsal
stream of processing directed toward posterior parietal cortex and
important in spatial aspects of vision. Thus, FSTD has direct connections
with ventral posterior parietal cortex (VPP), and connections with MT, the
medial superior temporal (MST), and dorsomedial (DM) visual areas, all
areas that relay to posterior parietal cortex. In contrast, FSTv does not
appear to have connections with either VPP or MST, and only sparse
connections with DM. Rather, major connections of FSTv are with inferior
temporal cortex. Thus, FSTv is more associated with the ventral stream of
processing related to object vision. However, both FSTv and FSTD have
connections with area 18 or V-II, the dorsolateral visual area, the frontal
eye field, and a frontal visual area. Interhemispheric connections of FSTD
include FSTD, MT, and MST, while interhemispheric connections of FSTv
include FSTv and MTc.
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