. Cunningham's Text-book of anatomy. Anatomy. 766 THE NERVOUS SYSTEM. Plexus Pelvini. The hypogastric nerves form the continuation of the aortic plexus into the pelvic cavity. They consist of numerous plexiform bundles of nerve-fibres which descend along the front and back of the bifurcation of the aorta and the origin of the common iliac arteries, and over the sacral promontory, where, becoming in- extricably mingled, they constitute the hypogastric plexus. The hypogastric plexus is continued downwards in front of the sacrum on either side of the rectum, and ends in the pelvic plexuses. The p
. Cunningham's Text-book of anatomy. Anatomy. 766 THE NERVOUS SYSTEM. Plexus Pelvini. The hypogastric nerves form the continuation of the aortic plexus into the pelvic cavity. They consist of numerous plexiform bundles of nerve-fibres which descend along the front and back of the bifurcation of the aorta and the origin of the common iliac arteries, and over the sacral promontory, where, becoming in- extricably mingled, they constitute the hypogastric plexus. The hypogastric plexus is continued downwards in front of the sacrum on either side of the rectum, and ends in the pelvic plexuses. The pelvic plexuses are formed by the separation of the hypogastric plexus into two halves on either side of the rectum. Each is joined by fibres from the upper portion of the pelvic part of the sympathetic trunk, and by the visceral branches (white rami communicantes) from the second and third or third and fourth sacral nerves. Accompanying the hypogastric artery and its branches, each pelvic plexus gives off subordinate plexuses for the pelvic viscera. a. Plexus Haemorrhoidalis.—The hemorrhoidal plexus supplies the rectum, and joins the superior hemorrhoidal plexus from the inferior mesenteric plexus. b. Plexus Vesicalis.—The vesical plexus accompanies the vesical arteries to the bladder-wall. Besides supplying the muscular wall and mucous membrane of the bladder, it forms subordinate plexuses for the lower part of the ureter, the vesicula seminalis, and the ductus deferens. c. Plexus Prostaticus.—-The prostatic plexus is of considerable size. It is placed on either side of the gland, and in addition to supplying its substance and the prostatic urethra, it sends offsets to the neck of the bladder and the vesicula seminalis. It is continued forwards on each side to form the plexus cavernosus penis (cavernous plexus of the penis). Bundles of nerves pierce the layers of the fascia of the urogenital diaphragm, and after supplying the membranous urethra, give off branches which e
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