. Cunningham's Text-book of anatomy. Anatomy. CEEEBEAL CONNEXIONS OF THE OPTIC TEACT. 619 Ceeebkal Connexions of the Optic Tract. The optic nerve is connected with the hypothalamus. At the optic chiasma the optic nerves of the two sides are joined together and a partial decussation of fibres takes place. The fibres which arise in the medial half of each retina cross the median plane and join the optic tract of the opposite side. The optic tract proceeds backwards round the cerebral peduncle, and in the neighbour- hood of the geniculate bodies appears to divide into two roots, viz., a lateral a
. Cunningham's Text-book of anatomy. Anatomy. CEEEBEAL CONNEXIONS OF THE OPTIC TEACT. 619 Ceeebkal Connexions of the Optic Tract. The optic nerve is connected with the hypothalamus. At the optic chiasma the optic nerves of the two sides are joined together and a partial decussation of fibres takes place. The fibres which arise in the medial half of each retina cross the median plane and join the optic tract of the opposite side. The optic tract proceeds backwards round the cerebral peduncle, and in the neighbour- hood of the geniculate bodies appears to divide into two roots, viz., a lateral and a medial (Fig. 546), but only the former is really part of the tract. Commissure of Gudden.—The so-called medial root disappears under cover of Tuberculum olfactorium Olfactory tract ' Optic tract Substantia perforata anterior Stria olfactoria lateralis upon anterior part of piriform area Nucleus amygdalae (cut surface) Piriform area (cut surface) Limen insuke Optic nerve /' Optic chiasma / / Tnfundibulum / Corpus mamillare / / Substantia perforata posterior I ' I Oculomotor nerve i i I I Internal capsule. Optic radiation / • i ,' ; Stria terminalis / I / .' Caudate nucleus / I ' \ Lateral geniculate body ; ; '• Brachium colliculi superioris / Thalamus (posterior tubercle) i Medial geniculate body Basis pedunculi cerebri Red nucleus Optic radiation / / Caudate nucleus z / j Stria terminalis Radiatio thalamo-temporalis (acoustic radiation) passing from the medial geniculate body into the anterior transverse temporal gyrus Substantia nigra Fig. 546.—The Ventral Aspect of Part of the Prosencephalon, showing the Right Optic Tract. The mesencephalon has been cut across. Olfactory area, dull yellow ; optic fibres, blue ; motor fibres, red ; acoustic fibres, bright yellow. the medial geniculate body and a large proportion of its fibres arise or end in this nuclear body. The medial root, although it is composed of fibres which are intermingled with those of the optic tract,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
