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The structure of the medial geniculate nucleus (MGN): A cyto‐ and myeloarchitectonic study in the squirrel monkey
Author(s) -
Jordan Hans
Publication year - 1973
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.901480405
Subject(s) - lateral geniculate nucleus , nucleus , anatomy , geniculate , biology , squirrel monkey , thalamus , saimiri sciureus , neuroscience , retina
The cyto‐ and myeloarchitectonic organization of the Medial Geniculate Nucleus (MGN) were investigated by means of several histological series sectioned in different planes. Eight hemispheres of normal adult monkeys (Saimiri sciureus) were used. The shape of the nucleus and its anatomical relationships to the surrounding structures were established. The MGN is ovoidshaped, forming a slight prominence at the ventrolateral surface of the brain. It is separated from the Lateral Geniculate Nucleus (LGN) by a capsule of myelinated fibers which surrounds the lateral and ventrocaudal aspects of the nucleus. The medial boundaries with the thalamic structures are difficult to determine. Three subdivisions of the nucleus were identified and their spatial interrelationships were determined: MGNa being composed of small irregularly shaped cells, MGNb containing both pale medium‐sized and large scattered multipolar nerve cells and MGNc with densely packed, medium‐sized and ovoid nerve cells. MGNa is located in the ventrocaudal portion of the nucleus, MGNb occupies most of the medial extent of MGN being laterally adjacent to MGNc.