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Bassett Collection of Stereoscopic Images of Human Anatomy

Dissection of muscles of male perineum and pelvic diaphragm

Pelvic diaphragm viewed from above

Image #174-7

KEYWORDS: Muscles and tendons.

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Higher resolution images are available for a fee. Contact Drew Bourn, PhD, MLIS.

Dissection of muscles of male perineum and pelvic diaphragm
Pelvic diaphragm viewed from above
The specimen shown in the previous view has been turned so that the pelvic diaphragm is seen from above and in front. The obturator fascia (14) has been preserved above the diaphragm on both sides and the superior fascia of the pelvic diaphragm (24) has been retained on the left side.
1 . Body of vertebra L. IV (pointer also indicates anterior longitudinal ligament)
2 . Transverse process vertebra L. IV
3 . Iliolumbar ligament
4 . Iliac crest
5 . Ventral sacroiliac ligament (lower pointer also indicates position of sacroiliac joint)
6 . Ala of ilium
7 . Lumbosacral trunk
8 . Coccygeus muscle
9 . Iliococcygeus muscle
10 . Pubococcygeus muscle
11 . Puborectalis muscle (9-11 make up the levator ani muscle)
12 . Tendinous arch of levator ani muscle
13 . Joint capsule of coccyx
14 . Obturator fascia (obturator internus muscle visible through fascia)
15 . Rectum (cut across at perineal flexure)
16 . Prostate
17 . Puboprostatic muscle
18 . Urethra
19 . Lateral part of sacrum
20 . Nutritive foramen
21 . Piriform muscle (cut off)
22 . Upper pointer: Intervertebral disc L. V - S. I Lower pointer: Coccyx
23 . Greater sciatic foramen
24 . Superior fascia of pelvic diaphragm (Levator ani muscle visible beneath fascia)
25 . Upper pointer: Linea terminalis Lower pointer: Line of attachment of fascia of psoas major muscle
26 . Upper pointer: Obturator fascia Lower pointer: Obturator canal
27 . Inguinal ligament
28 . Pectineal ligament
29 . Lacunar ligament
30 . Body of pubic bone
31 . Pubic symphysis