ANATOMY OF THE BRAIN
Anatomical model of the human brain or encephalon (cross-section). The encephalon is composed of the diencephalon, covered by the cerebrum (flesh colored). The cerebellum (in brown) and the brain stem (in white) lie under the cerebrum. The surface of the cerebral cortex has a number of bumps or ridges, known as gyri, separated by folds known as sulci (notably, the cingulate sulcus, above the corpus callosum, the calcarine sulcus, and the transverse occipital sulculs above the cerebellum). The brain is divided by the medial longitudinal fissure into two hemispheres. Here, the right hemisphere is shown laterally. Each hemisphere is composed of four lobes - the frontal (anterior region, to the left of the picture, parietal (superior region) temporal (lateral region), and occipital (posterior region) lobes. The corpus callosum (in white), i wide strip of white matter, links the two hemispheres and separates the brain anatomically from the diencephalon. Ventra to the corpus callosum, the septum lucidum (flesh colored) is a thin membrane separating the lateral ventricles, two of the four brain cavities filled with cerebrospinal fluid. Cerebrospinal fluid is produced in the choroid plexus, consisting of folds in the meninges (membranes enveloping the brain and the spinal cord) located on the internal walls of the ventricles. The choroid plexus of the third cerebral ventrical (in pink) extends above the thalamus. The third ventricle is a small cavity located above the choroid plexus. The fornix (in white), like the corpus callosum, is a commissure of white matter linking together the various regions of the encephalon. It is a C-shaped bundle of fibers and only its anterior portion is visible in cross-section. It links the hippocampus (hidden here by the brain stem) to the mamillary bodies of the hypothalamus (round, white protuberance located anterior to the mesencephalon, above the pons of the brain stem). The diencephalon, internal portion of the encephalon, is made up
Size: 3630px × 2365px
Photo credit: © GOUNOT/3B SCIENTIFIC / BSIP / Alamy / Afripics
License: Licensed
Model Released: No
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