Bassett Collection of Stereoscopic Images of Human Anatomy

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Dissection of male pelvis from a lateral approach

Sigmoid colon, rectum and anal canal opened in situ, left anterolateral view

Image #171-6

KEYWORDS: Anal canal, Large intestine.

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Dissection of male pelvis from a lateral approach

Sigmoid colon, rectum and anal canal opened in situ, left anterolateral view

A longitudinal incision has been made through the anterior wall of the sigmoid colon and rectum to demonstrate the features of the lumen of this part of the intestine. At the perineal flexure of the rectum a short transverse cut has been made to connect with a laterally placed longitudinal incision into the anal canal. The specimen is viewed from in front and to the left.

1 .	External iliac artery
2 .	Psoas major muscle
3 .	External iliac lymph node
4 .	Ureter right
5 .	Upper pointer: Lateral umbilical ligament Lower pointer: Ductus deferens
6 .	Urinary bladder (opened)
7 .	Rectus abdominis muscle right (reflected downward and to the right)
8 .	Pubic symphysis (sectioned)
9 .	Prostate
10 .	Internal iliac artery
11 .	Internal iliac vein
12 .	Sigmoid colon (opened)
13 .	Left internal iliac artery
14 .	Lumbosacral trunk
15 .	Articular surface of sacrum
16 .	Piriform muscle
17 .	Ductus deferens left (cut off)
18 .	Pelvic plexus
19 .	Rectum (opened note outer longitudinal and inner circular layers of smooth muscle visible in cut section of wall)
20 .	Plicae transversales of rectum (middle and lower)
21 .	Left pointer: Ureter left (cut off) Right pointer: Seminal vesicle
22 .	Anal canal