Exploration of the brain from its superior aspect

Lateral fissure and insula

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Image #9-1
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Legend Image
Exploration of the brain from its superior aspect
Lateral fissure and insula
The lateral fissure has now been extensively exposed from above by the removal of the frontal and parietal opercula. The superior longitudinal fasciculus (4) has been cut away to reveal the insula. The principal cortical branches of the middle cerebral artery lie within the lateral fissure. The portion of the temporal lobe facing the fissure displays transversely oriented gyri (of Heschl) wherein the fibers of the central auditory pathway terminate.
1 . Medullary substance of superior frontal gyrus
2 . Superior cerebral vein is in superior frontal sulcus
3 . Cingulum (cut off)
4 . Anterior continuation of superior longitudinal fasciculus
5 . Frontal branches of orbitofrontal artery
6 . Insula
7 . Artery of precentral sulcus
8 . Artery of central sulcus (Note cut end of great anastomotic vein in meninges close to cut end of this artery)
9 . Transverse temporal gyrus (of Heschl)
10 . Sulcus circularis Note: this sulcus surrounds the insula in the depths of the lateral fissure
11 . Anterior and posterior parietal arteries
12 . Posterior portion of superior longitudinal fasciculus (cut off)
13 . Geniculocalcarine tract and inferior longitudinal fasciculus joining occipital part internal capsule
14 . Occipital part internal capsule and occipital part of radiations of corpus callosum
15 . Branch of posterior cerebral artery in depths of parieto-occipital fissure
16 . Branch of posterior cerebral artery in calcarine fissure (exposed by removing cuneus)
17 . Medullary substance of cuneus
18 . Frontal pole
19 . Superior frontal gyrus
20 . Cingulate gyrus (cut across)
21 . Central sulcus (Rolandic)
22 . Corona radiata
23 . Medial and lateral longitudinal striae