Bassett Collection of Stereoscopic Images of Human Anatomy

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Exploration of the brain from the medial aspect

Internal capsule, ansa lenticularis and subthalamic nucleus

Image #16-7

KEYWORDS: Brain, Diencephalon, Midbrain, Telencephalon.

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Exploration of the brain from the medial aspect

Internal capsule, ansa lenticularis and subthalamic nucleus

The mammillary body, the remaining portion of the column of the fornix and mammillothalamic tract have been removed. The optic tract has now been partially exposed. Most of the thalamic tissue has been scraped away to expose the internal capsule. The continuity of the cerebral peduncle into the internal capsule is thus made clearly visible. Fibers of the ansa lenticularis (25) can be seen to loop around the medial border of the internal capsule in their course from the globus pallidus to the tegmentum of the subthalamic region. Numerous broken ends of fibers passing from the thalamus into the internal capsule are seen at (20) and at (6).

1 .	Pericallosal artery (retracted upward)
2 .	Cingulate gyrus
3 .	Cingulum
4 .	Caudate nucleus
5 .	Stria terminalis
6 .	Internal capsule
7 .	Anterior commissure
8 .	Fibers of rostrum of corpus callosum passing into anterior part of superior frontal gyrus
9 .	Orbital artery
10 .	Anterior cerebral artery
11 .	Optic tract
12 .	Infundibulum
13 .	Internal carotid artery (cut across)
14 .	Oculomotor nerve (III) and cerebral peduncle
15 .	Uncus (hippocampal gyrus)
16 .	Basilar artery
17 .	Longitudinal fasciculus (pyramidal) of pons
18 .	Subparietal sulcus
19 .	Corpus callosum (splenium)
20 .	Broken ends of fibers of thalamic radiation into internal capsule
21 .	Cut wall of posterior part of thalamus (postero-lateral nucleus and pulvinar)
22 .	Posterior cerebral artery (lying within transverse fissure)
23 .	Ventral posterior lateral nucleus of thalamus (slight discoloration due to blood pigment)
24 .	Hypothalamic nucleus
25 .	Ansa lenticularis
26 .	Medial lemniscus (cut across)
27 .	Brachium conjunctivum (superior cerebellar peduncle) (cut across)
28 .	Basilar part of pons (cut surface in midsagittal plane)