. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 404 HUMAN PHYSIOLOGY The Brain of Man. — In man, as in the frog, the central nervous system consists of a brain and spinal cord inclosed in a bony case with the nerves leaving^ it. From the brain, twelve pairs of nerves are given off; thirty-one more leave the spinal cord. Along the course of some of these nerves are found ganglia. The brain has three divisions. The cerebrum makes up the largest part. In this respect it differs from the cerebrum of the frog and other verte- brates. It is di
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 404 HUMAN PHYSIOLOGY The Brain of Man. — In man, as in the frog, the central nervous system consists of a brain and spinal cord inclosed in a bony case with the nerves leaving^ it. From the brain, twelve pairs of nerves are given off; thirty-one more leave the spinal cord. Along the course of some of these nerves are found ganglia. The brain has three divisions. The cerebrum makes up the largest part. In this respect it differs from the cerebrum of the frog and other verte- brates. It is divided into two lobes, the hemispheres, which are connected with each other by a broad band of nerve fibers. The Cerebrum Cerebellum —. Medulla The brain, with parts separated to show each clearly. outer surface of the cerebrum is thrown into folds or convolutions. The outer layer, seen in section, is gray in color, made up of nerve cells and supporting material (the neuroglia, a kind of connective tissue). The inner part (white in color) is composed largely of fibers which pass to other parts of the brain and down into the spinal cord. (In man, the midbrain is covered by the cerebrum, and need not be considered in this description.) Under the cerebrum, and dorsal to it, lies the little brain, or cerebellum, a part of the hindbrain. This part consists of nerve cells and fibers. The two sides of the cerebellum are connected by a band of nerve. 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 Hunter, George William, 1873-1948. New York, American book company
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