Bassett Collection of Stereoscopic Images of Human Anatomy

Exploration of the brain from its basal aspect

Relations of internal capsule, lentiform nucleus and ansa lenticularis

Image #5-6

KEYWORDS: Brain, Midbrain, Peripheral nervous system, Telencephalon.

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Exploration of the brain from its basal aspect

Relations of internal capsule, lentiform nucleus and ansa lenticularis

The anterior half of the lentiform nucleus has been cut away to expose the internal capsule. Broken ends of fibres seen protruding from the capsule joined the external medullary lamina which is visible on the cut surface of the lentiform nucleus. The upper part of the external capsule remains in place. The mass of fibers (15) passing across the cerebral peduncle consists mainly of efferent fibers from the medial division of the globus pallidus which loop around the medial margin of the peduncle. Some of these fibers penetrate between bundles of the peduncle (or internal capsule) to form the fasciculus lenticularis internally. The optic tract is divided and turned posteriorly.

1 .	Frontal part of operculum
2 .	Recurrent artery of Heubner
3 .	Middle cerebral artery (retracted laterally)
4 .	External capsule (cut across)
5 .	Internal capsule
6 .	Superior longitudinal fasciculus
7 .	Lentiform nucleus (putamen)
8 .	Geniculocalcarine tract
9 .	Head of caudate nucleus
10 .	Fibers radiating from rostral lamina of corpus callosum
11 .	Orbital gyrus (dissected)
12 .	Olfactory tract
13 .	Optic chiasm
14 .	Posterior part of anterior commissure
15 .	Ansa lenticularis
16 .	Cerebral peduncle
17 .	Optic tract (retracted posteriorly)
18 .	Posterior cerebral artery (cut across)
19 .	Pons