Exploration of the brain from its basal aspect
Relations of internal capsule, lentiform nucleus and ansa lenticularis
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Image #5-6
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.
- Frontal part of operculum
- Recurrent artery of Heubner
- Middle cerebral artery (retracted laterally)
- External capsule (cut across)
- Internal capsule
- Superior longitudinal fasciculus
- Lentiform nucleus (putamen)
- Geniculocalcarine tract
- Head of caudate nucleus
- Fibers radiating from rostral lamina of corpus callosum
- Orbital gyrus (dissected)
- Olfactory tract
- Optic chiasm
- Posterior part of anterior commissure
- Ansa lenticularis
- Cerebral peduncle
- Optic tract (retracted posteriorly)
- Posterior cerebral artery (cut across)
- Pons