Identify and clean the arteries and nerves of the pelvis. (BOTH SIDES)

1. Return to the common iliac artery. Identify the external and internal iliac arteries. (G 5.27;N 379;Gl 16.7) You may remove any or all of the veins that obstruct the dissection field. Be sure to blunt dissect the veins before you cut and remove them from the cadaver. Identify the inferior epigastric artery where it arises from the external iliac artery. Attempt to identify the origin of the deep circumflex iliac artery.
2. Trace and clean the branches of the internal iliac artery.
3. Identify the obliterated umbilical artery extending to the anterior abdominal wall (median umbilical fold). Identify the superior vesical arteries typically arising from the proximal segment of the obliterated umbilical artery. (G 5.26A;N 383;Gl 22.1)
4. Identify the obturator artery exiting the pelvis with the obturator nerve.
5. Return to lumbosacral trunk. Trace the lumbosacral trunk distally until it is joined by ventral rami S1 and S2. (G 4.77;N 380;Gl 16.34) Identify the iliolumbar and lateral sacral arteries. (G 5.13;N 381;Gl 22.1) Identify the superior gluteal artery. (G 5.27A;N 380;Gl 22.1) The superior gluteal artery typically passes between the lumbosacral trunk and ventral ramus S1. Identify the inferior gluteal artery. (G 5.17;N 380;Gl 22.1) The inferior gluteal artery often passes between ventral rami S1 and S2.
6. Identify the internal pudendal artery. If you are not sure of your identification of the superior gluteal, inferior gluteal and internal pudendal arteries, then return to the gluteal region. Clamp one or more of the arteries with a hemostat and gently tug on the arteries while observing the pelvic branches of the internal iliac artery. Identify and clean the piriformis muscle. (G 5.10A;N 338;Gl 19.13C) Attempt to identify the pudendal nerve as it arises from the sacral plexus.