Interior of the cerebral hemispheres

Interior of the cerebral hemispheres
Medial surface of left cerebral hemisphere.
Horizontal section of right cerebral hemisphere.
Anatomical terms of neuroanatomy [edit on Wikidata]

The interior of the cerebral hemispheres is a portion of the cerebrum.

It includes the lateral ventricles, basal nuclei, and white matter of the cerebrum.^[1]

Composition

If the upper part of either hemisphere be removed, at a level about 1.25 cm. above the corpus callosum, the central white substance will be exposed as an oval-shaped area, the centrum ovale minus, surrounded by a narrow convoluted margin of gray substance, and studded with numerous minute red dots (puncta vasculosa), produced by the escape of blood from divided bloodvessels.

If the remaining portions of the hemispheres be slightly drawn apart a broad band of white substance, the corpus callosum, will be observed, connecting them at the bottom of the longitudinal fissure; the margins of the hemispheres which overlap the corpus callosum are called the labia cerebri.

Each labium is part of the cingulate gyrus already described; and the slit-like interval between it and the upper surface of the corpus callosum is termed the callosal fissure.

If the hemispheres be sliced off to a level with the upper surface of the corpus callosum, the white substance of that structure will be seen connecting the two hemispheres.

The large expanse of medullary matter now exposed, surrounded by the convoluted margin of gray substance, is called the centrum ovale majus.

Additional images

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  Human brain right dissected lateral view

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  Coronal section of brain immediately in front of pons.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

1. Snell, Richard S. (2009). Clinical Neuroanatomy (Clinical Neuroanatomy for Medical Students (Snell)). Hagerstwon, MD: Lippincott Williams & Wilkins. p. 262. ISBN 0-7817-9427-7.