Arteries

Changes in its place of origin have already been noticed. The artery itself is sometimes small, or defective in one or two, or but rarely three of its usual branches.

The uterine artery [a. uterina], is directed downwards from the anterior division of the internal iliac artery towards the neck of the uterus.

The anastomosis which exists between the obturator artery (when that vessel is derived from the internal iliac) and the epigastric, by means of those small branches of each which ramify behind the pubes, serves to afford some explanation of one of the most striking instances of variety of origin met with in the arterial system, viz., the transfer of the origin of the obturator from the internal iliac to the epigastric artery.

The urinary bladder receives several arteries, amongst which, however, may be specially recognised two principal branches, a superior and an inferior vesical artery.

The obturator artery [a.obturatoria], when derived from the internal iliac, usually arises from the anterior division of that vessel, but not infrequently from its posterior division. The artery is directed forwards through the pelvis to reach the groove on the under surface of the horizontal portion of the pubes, at the upper part of the thyroid foramen. Beneath this bone it passes out of the pelvis, and immediately divides into its terminal branches. In its course through the pelvis the artery is placed between the pelvic fascia and the peritoneum, a little below the obturator nerve. Beneath the pubes it lies with the nerve in an oblique canal, formed partly by the groove in the bone, and partly by fibrous tissue.

 

 

 

This artery has been tied for aneurism affecting one of its large branches on the back of the pelvis — the gluteal or sciatic.

The vagina principally derives its arteries from a branch which is analogous to the inferior vesical in the male.

The internal iliac artery [a. iliaca interna; French: Artère iliaque interne ; Syn: hypogastrica, pelvica], short and thick trunk, separates from the external iliac immediately after its origin, and dips into the pelvis to supply the walls and the viscera of that cavity.

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