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The visual pathways of the lorisid lemurs ( Nycticebus coucang and Galago crassicaudatus )
Author(s) -
Laemle Lois Kalus,
Noback Charles R.
Publication year - 1970
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.901380105
Subject(s) - parvocellular cell , biology , optic tract , anatomy , pretectal area , galago , lateral geniculate nucleus , superior colliculus , magnocellular cell , oculomotor nucleus , optic nerve , neuroscience , retina , primate , nucleus , midbrain , central nervous system
Abstract The primary projections of the optic nerve were investigated in two species of lorisid lemurs ( Nycticebus coucang and Galago crassicaudatus ) following unilateral enucleation of an eye. In addition, the cytoarchitecture of the lateral geniculate body and of the pretectum is described. The lateral geniculate nucleus is composed of six cellular laminae – four magnocellular and two parvocellular. Optic nerve fibers from the retina of an eye terminate in laminae 1, 5 and 6 of the lateral geniculate body on the side opposite to the enucleated eye and laminae 2, 3 and 4 of the lateral geniculate body on the same side as the enucleated eye. Retinofugal fibers were also observed to project to the pregeniculate nucleus, nucleus of the optic tract, pretectal nucleus and superior colliculus on both the same side as and on the side opposite to the enucleated eye. A completely crossed accessory optic tract was noted. The lateral geniculate bodies of a Galago “borgne” (one blind atrophic eye) are also described.