FIG. 3.—The distribution of the pudic nerve, n. pudendus, in the female perineal and pubic regions. The trunk of the pubic nerve, n. pudendus, is covered by the gluteus maximus muscle. On the right side of the body the branches of the inferior pudendal nerve, rami perineales, nervi cutanei fermoris posterioris have been dissected out; but the branches of this nerve to the labium majus have been cut short. The formation of the anococcygeal or subcaudal nerves, nn. anococcygei, out of the posterior primary division of the coccygeal nerve and out of the perforating branches which arise from the anterior primary divisions of the fourth and fifth sacral nerves and the coccygeal nerve. (From Toldt: Atlas of Human Anatomy.—Rebman Company, New York.) ] The greater number of the spinal nerves distributed to the genital organs arise from the lumbar portion of the spinal cord, pass as rami communicantes to the first four lumbar ganglia of the great sympathetic cord, whence they proceed to the series of symmetrical (paired) and asymmetrical (azygos) sympathetic plexuses in front of, and adjacent to the abdominal aorta, which already contain afferent and efferent spinal fibres derived from the pneumogastric, phrenic, and splanchnic nerves. A small number only of coarse nerve-filaments, a larger number of fine nerve-filaments, derived from the sacral nerves, proceed direct to the internal genital organs; many of these fibres enter the lower extremity of the pelvic or inferior hypogastric pleans, some pass to the cervical ganglia of the uterus. Below the bifurcation of the aorta and in front of the sacral promontory, a large number of the uterine nerves, both of spinal and of sympathetic origin, unite to form an azygos plexus which has been shown by experiment to possess great functional importance. Anatomically this constitutes the upper undivided portion of the hypogastric plexus, which is the downward continuation of the abdominal aortic sympathetic plexus; but inasmuch as it is the principal channel of nervous impulses to the uterus it is often known at the present day as the great uterine plexus (_plexus uterinus magnus_). The nerves to the ovary and Fallopian tube (ovarian nerves) are derived from the spermatic (ovarian) plexus, an offshoot of the renal plexus; as the spermatic plexus descends, it is reinforced by branches from the abdominal aortic plexus, these branches often arising from a small ganglion (spermatic ganglion). The hypogastric or great uterine plexus, single and median above, divides below into the paired pelvic or inferior hypogastric plexuses, which pass downward and forward on either side of the rectum; these plexuses are reinforced by spinal elements derived from the sacral nerves. Before the terminal expansions of the pelvic or inferior hypogastric plexus enter the tissues of the internal genital organs, the bladder, and the rectum, small masses of ganglionic