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Laboratory 43. The Female Pelvis
Step 12. The External and Internal Iliac Vessels

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Remove the peritoneum and the underlying fat from the lateral pelvic wall to identify the pelvic vessels and nerves and the pelvic portion of the ureter.

The major artery which supplies the pelvic viscera is the internal iliac artery. To study the internal iliac artery and its branches, it is recommended that the internal iliac vein and its tributaries be identified and removed. Trace the common iliac arteries to the bifurcation of the abdominal aorta. At this bifurcation, attempt to identify the middle sacral artery, which descends into the pelvis in the midline just anterior to the sacrum.

At the level of the sacroiliac joint, the common iliac artery divides into the external iliac artery and the internal iliac artery. The internal iliac artery crosses the pelvic brim, where it gives parietal branches to the walls of the pelvis and visceral branches
to supply the pelvic organs.

Links and References:
Grant's: 3.55
Netter (1ed.): 373, 377 (2ed.): 369, 373
Rohen/Yokochi: 338, 339