. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. EXTEKNAL EEATUKES OP THE HUMAN BKAIN 393 than the frog's has, and this organ is here divided into two lobes by a longitudinal partition. Underneath the cere- bellum, and extending downward, is the wedge-shaped medulla. In comparison with our figure the hindbrain occupies the position of the stem of the interrogation point, and if this were continued downward the extension would represent the spinal cord. External features of the human brain.— Viewed from the top, the two hemispheres of the forebrain (the cere- h
. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. EXTEKNAL EEATUKES OP THE HUMAN BKAIN 393 than the frog's has, and this organ is here divided into two lobes by a longitudinal partition. Underneath the cere- bellum, and extending downward, is the wedge-shaped medulla. In comparison with our figure the hindbrain occupies the position of the stem of the interrogation point, and if this were continued downward the extension would represent the spinal cord. External features of the human brain.— Viewed from the top, the two hemispheres of the forebrain (the cere- hrum) are seen to be much convoluted and folded, thus increasing their surface without increasing the space occu- pied. The two hemispheres are pressed closely together, the line of separation being marked by a fissure (the longitudinal fissure). Viewed from the bottom we can make out the con- tinuation of this fissm-e back to the midbrain, and on each side of it appear the olfactory lobes. (See Fig. 182.) Just back of these lobes are the crossed optic nerves (the optic chiasma) which enter the optic lobes. Back of this chiasma is a band of white matter (the pons varolii) which connects the two lobes of the cerebellum and covers the top of the medulla. Underneath this pons, the medulla divides into two stalks (the crura cerebri) which spread out to form the cerebral hemispheres,. Fig. 181- Cerebral hemispheres viewed from Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eddy, Walter Hollis, b. 1877. New York, Cincinnati [etc. ] American book Co
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