. Animal physiology. Physiology, Comparative; Physiology, Comparative. CEREBROSPINAL NERVES. SYMPATHETIC SYSTEM. 353 in a bundle of nerves, to which the name cauda equina is given, from its resemblance to a horse's tail. The various pairs of nerves from 1 to 14 are the same as in the preceding description ; 15 and 16 are nerves from the upper part of the cervical region ; 25, a pair from the dorsal region ; and 33, a pair from the lumbar region. All these spinal nerves find their way out through apertures in the vertebral column, which are formed by a union of two notches, one in each of the a
. Animal physiology. Physiology, Comparative; Physiology, Comparative. CEREBROSPINAL NERVES. SYMPATHETIC SYSTEM. 353 in a bundle of nerves, to which the name cauda equina is given, from its resemblance to a horse's tail. The various pairs of nerves from 1 to 14 are the same as in the preceding description ; 15 and 16 are nerves from the upper part of the cervical region ; 25, a pair from the dorsal region ; and 33, a pair from the lumbar region. All these spinal nerves find their way out through apertures in the vertebral column, which are formed by a union of two notches, one in each of the adjoining vertebras. 461. The system of nerves which we have been describing is termed the cere- Iro-spinal; but it is not the only set of nerves and ganglia contained within the bodies of Yertebrated animals. In front of the vertebral column there is a chain of oblong ganglia, which communicate with two large ganglia that lie among the intestines, and with several small ganglia in the head and other parts. They communicate also with the poste- rior roots of the spinal nerves, on which are another set of ganglia (c, Fig. 180), that seem to belong to this system. The nerves proceeding from this system, which is called the sympathetic^ are not distributed, like those of the cere- brospinal, to the skin and muscles ; but to the organs of diges- tion and secretion, and to the heart and blood-vessels. Hence the former system of nerves, being that by which sensations are received and spontaneous motions executed, is called the nervous system of animal life; whilst the latter, being connected with the nutritive processes alone, is termed the nervous system of organic life. What is the nature of the influence which it exerts. Fig. 186.—Brain and Spinal Cord of 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 C
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