Bassett Collection of Stereoscopic Images of Human Anatomy

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Exploration of the brain from its superior aspect

Hippocampal commissure, crura of fornix and transverse fissure

Image #10-4

KEYWORDS: Brain, Meninges, Telencephalon, Ventricules.

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Exploration of the brain from its superior aspect

Hippocampal commissure, crura of fornix and transverse fissure

Close-up view of the region of the hippocampal commisure which in this specimen consists of only a few fibers crossing between the hippocampi, posterior to the crura of the fornix. Some of the commissural fibers which are visible to the left of the midline cut belong to the corpus callosum and can be traced into the most medial part of the forceps major. The prominence formed by these fibers within the ventricle is named the bulbus cornu posterioris. To the right of the sagittal cut more callosal fibers have been removed to reveal the meninges and vessels underlying the splenium.

1 .	Choroidal branch of posterior cerebral artery lying along choroidal fissure of lateral ventricle
2 .	Lamina affixa
3 .	Fornix (crus)
4 .	Choroidal fissure
5 .	Hippocampal commissure (cut through in midline)
6 .	Hippocampus
7 .	Calcar avis
8 .	Fibers of occipital part radiations of corpus callosum
9 .	Fibers of the cingulum (cut across) radiating posteriorly
10 .	Limbic lobe (cut across)
11 .	Posterior cerebral artery (cut across) lying within parieto-occipital fissure
12 .	Cut edges of septum pellucidum
13 .	Choroid plexus lateral ventricle
14 .	Stria terminalis (covered by ependyma)
15 .	Choroidal branch of posterior cerebral artery lying within transverse fissure
16 .	Fornix (crus)
17 .	Hippocampus
18 .	Broken ends of fibers of medial and lateral longitudinal striae entering region of dentate fascia
19 .	Posterior cerebral artery right (several branches cut across)
20 .	Dissected fibers of occipital part of radiations of corpus callosum
21 .	Surface of lingual gyrus within parieto-occipital fissure
22 .	Arcuate fibers within depths of parieto-occipital fissure
23 .	Superior cerebellar artery ramifying upon cerebellum