Exploration of the brain from its basal aspect

Ansa lenticularis

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Image #5-7
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Exploration of the brain from its basal aspect
Ansa lenticularis
This view is a close-up of the previous one but the specimen is now turned at right angles so that the midline is at the bottom. Details of the ansa lenticularis (13) in its course around the medial edge of the cerebral peduncle are revealed. Some fibers of this group are also seen as they pass inward between fascicles of the peduncle and these join others above the peduncle to form the fasciculus lenticularis (H2 field of Forel) in the subthalamic region.
1 . Lateral geniculate body
2 . Optic tract (cut and retracted posteriorly)
3 . Cerebral peduncle
4 . Posterior cerebral artery (cut across)
5 . Pons
6 . Superior cerebellar artery
7 . Oculomotor nerve (III)
8 . Mamillary body
9 . Putamen
10 . Internal capsule
11 . Globus pallidus (external division)
12 . Anterior commissure
13 . Ansa lenticularis
14 . Artery of Heubner
15 . Diagonal band of Broca
16 . Radiating fibers of rostral lamina of corpus callosum
17 . Anterior perforated substance
18 . Anterior cerebral artery (cut across)
19 . Olfactory trigone
20 . Optic nerve (II)