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Experimental‐anatomical studies on the “middle temporal visual area (MT)” in primates. I. Efferent cortico‐cortical connections in the marmoset Callithrix jacchus
Author(s) -
Spatz W. B.,
Tigges J.
Publication year - 1972
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901460403
Subject(s) - efferent , biology , neuroscience , anatomy , projection (relational algebra) , primate , computer science , afferent , algorithm
The efferent cortico‐cortical fiber connections of the middle temporal visual area (MT) have been studied. The primate area MT was shown by various authors to receive a fiber projection from area 17; physiologically it shows a retinotopical organization. Lesions placed in area MT of Callithrix revealed a surprising variety of cortico‐cortical connections. Termination sites of degenerating axons were found ipsilaterally in the frontal eye field and in eight regions of the temporal, parietal and occipital lobes all known to be photically responsive. Callosal fibers terminated in the contralateral area MT and in two adjoining areas. The termination site in area MT suggested a homotopic point to point connection meaning that in area MT the entire retinal representation is connected transcallosally, whereas in the classical visual areas only the regions of midline representation are connected. The projection of intrinsic interlaminar fibers from the supragranular layers upon layer V was weakly developed in area MT.