Anatomy study note · Pelvis

Sigmoid colon

The S-shaped, mobile part of the colon, 25–38 cm long, from the pelvic brim to the front of S3 where it becomes the rectum. It is attached to the posterior pelvic wall by the fan-shaped sigmoid mesocolon.

Key points

• Pelvic brim → S3; on the sigmoid mesocolon.
• Sigmoid arteries (IMA).
• Volvulus, diverticula, colostomy site.
• Hindgut; keeps the pelvic mesocolon.
• Diverticulitis: mainly sigmoid.
• Colon: no villi, many goblet cells.

The full note in the atlas also covers

Relations · Blood supply · Nerve supply · Lymph drainage · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 9, PDF pp. 1068–1074
• Inderbir Singh’s Human Embryology, ch. 13, PDF pp. 179, 187
• BRS Cell Biology & Histology, 7th ed., ch. 16, PDF pp. 296–297, 297–298

More from the pelvis

• Urinary bladder
• Uterine artery
• Uterine tube
• Uterus
• Vagina
• Coccygeus
• Coccyx
• Hip bone
• Internal iliac artery
• Internal iliac vein
• Levator ani
• Ligaments of the uterus

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