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Bassett Collection of Stereoscopic Images of Human Anatomy

Dissection of male pelvis from a lateral approach

Obturator internus muscle and nerve supply, medial view

Image #172-7

KEYWORDS: Muscles and tendons, Peripheral nervous system.

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Dissection of male pelvis from a lateral approach
Obturator internus muscle and nerve supply, medial view
The pelvic diaphragm has been removed from the specimen and the obturator fascia has been stripped away.
1 . Iliac branch of iliolumbar artery
2 . Iliac crest
3 . Obturator internus muscle
4 . Obturator nerve
5 . Iliopsoas muscle
6 . Obturator artery
7 . Superior pubic ramus
8 . Pubic symphysis (sectioned)
9 . Pubic arcuate ligament
10 . Inferior pubic ramus
11 . Ramus of ischium
12 . Ramus communicans (to sacral nerve I)
13 . Lumbosacral trunk
14 . Sacral nerve I (ventral ramus)
15 . Sympathetic trunk (pointer on ganglion)
16 . Anterior (pelvic) sacral foramen (pointer indicates opening within sacral canal exposed by cutting through sacrum)
17 . Rami communicantes
18 . Left pointer: Sacral nerve II Right pointer: Sacral nerve III
19 . Sacrum
20 . Piriform muscle
21 . Inferior gluteal artery
22 . Sacral nerve IV
23 . Upper pointer: Inferior rectal nerve Lower pointer: Pudendal nerve
24 . Upper pointer: Branch of sacral nerve III to posterior femoral cutaneous nerve Lower pointer: Sciatic nerve
25 . Nerve to obturator internus muscle (indicated in two places)
26 . Coccygeus muscle
27 . Location of ischial spine
28 . Coccyx
29 . Internal pudendal artery
30 . Sacrotuberous ligament (cut off at attachment)
31 . Ischial tuberosity