Microradiograph of eye; central optic pathways and related structures

Relations of optic pathways at base of brain.

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Image #58A-5

Microradiograph of eye; central optic pathways and related structures Relations of optic pathways at base of brain. The specimen shown in the preceding photograph has been reoriented for this view so that the left orbit extends above and to the left of the area included in the photograph. The brain stem has been cut across through the rostral part of the mesencephalon. The left optic tract has been removed and the optic chiasm has been lifted slightly out of its normal position. The components of the arterial circle of Willis that are related to the optic pathways (i.e., internal carotid artery (6), anterior cerebral artery (5), anterior communicating artery (between 5 and 19, unlabeled), posterior communicating artery (8) and posterior cerebral artery (11)) remain in position. 1 . Olfactory tract (cut across) 2 . Inferior cerebral vein 3 . Ala parva ossis sphenoidalis (covered by dura) 4 . Medial cerebral artery (cut across) 5 . Left anterior cerebral artery 6 . Internal carotid artery 7 . Chiasmatic cistern 8 . Upper pointer: Anterior choroid artery (cut across) Lower pointer: Posterior communicating artery 9 . Optic tract (cut across and elevated) 10 . Oculomotor nerve (III) 11 . Posterior cerebral artery 12 . Central ramus of posterior cerebral artery 13 . Tributaries of the basal vein which passed into tip of inferior horn of lateral ventricle 14 . Substantia nigra 15 . Nucleus ruber 16 . Basal vein 17 . Cerebellar tentorium 18 . Continuation of main trunk of posterior cerebral artery 19 . Right anterior cerebral artery (anterior communicating artery partly obscured by optic chiasm) 20 . Falx cerebri 21 . Cingulate gyrus 22 . Pericallosal branch of anterior cerebral artery 23 . Anterior commissure 24 . Pars libera columnae fornicis 25 . Ventricular surface of hypothalamus 26 . Mamillary body (cut across) 27 . Intermediate mass 28 . Cerebral peduncle 29 . Internal cerebral veins 30 . Aditus ad aqueductum cerebri 31 . Posterior commissure 32 . Splenium corporis callosi * . [Legend above restored translation from Latin]