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Exploration of a brain cut in frontal section at the splenium of the corpus callosum

Ansa lenticularis and internal capsule

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Image #23-3
Bassett ImageDiagram Image
Legend Image
Exploration of a brain cut in frontal section at the splenium of the corpus callosum
Ansa lenticularis and internal capsule
The thalamus has now been almost completely removed, the anterior and medial portion being all that remains. The subthalamic nucleus is left in place. Fibers of the ansa lenticularis (5) lie above this nucleus and pass laterally toward the ventral lateral nucleus (now removed) and ventral anterior nucleus (removed). The mass of fibers which forms the posterior stalk of the thalamus is visible in the lateral and posterior wall of the thalamic dissection. The fasciculus retroflexus is exposed farther ventrally toward the interpeduncular fossa.
1 . Corpus callosum
2 . Fornix (crus)
3 . Pulvinar
4 . Retroflex fasciculus
5 . Ansa lenticularis
6 . Posterior cerebral artery (cut across)
7 . Superior cerebellar artery (cut across)
8 . Fourth ventricle
9 . Cingulate gyrus
10 . Central part lateral ventricle
11 . Caudate nucleus (tail)
12 . Anterior part of thalamus (in depths of dissected area)
13 . Posterior stalk of thalamus
14 . Internal capsule
15 . Mamillothalamic tract (cut across)
16 . Hypothalamic nucleus
17 . Cerebral peduncle
18 . Brachium conjunctivum (superior cerebellar peduncle) (cut across)
19 . Deep pontine fibers
20 . Brachium pontis (middle cerebellar peduncle) (cut across)
21 . Pyramid medulla oblongata