University:
Kentucky State University
Course:
BIO 301 | Human Anatomy
Academic year:

2023
Views:

305

Pages:

6
Author:

Alma Stephenson

Descending Colon Location and Description: • The descending colon is about 10 in. (25 cm) long • It extends downward from the left colic flexure, to the pelvic brim, where it becomes continuous with the sigmoid colon. • Taenia coli, sacculation & appendeces epiplolca are present • The peritoneum - Covers the front and the sides and binds it to the posterior abdominal wall. Relations of Descending colon • • - - - Anteriorly: Coils of small intestine the greater omentum the anterior abdominal wall Posteriorly: The lateral border of the left kidney the origin of the transversus abdominis muscle the quadratus lumborum the iliac crest the iliacus the left psoas The iliohypogastric and the ilioinguinal nerves the lateral cutaneous nerve of the thigh the femoral nerve Relations of Descending colon Blood Supply of Descending colon • Arteries - The left colic and the sigmoid branches of the inferior mesenteric artery. • Veins - The veins correspond to the arteries →drain into the inferior mesenteric vein. Lymphatic Drainage of descending colon • Lymphatic drains →the colic lymphatic nodes & the inferior mesenteric nodes around the origin of the inferior mesenteric artery. Nerve Supply of descending colon • The nerve supply is the sympathetic and parasympathetic pelvic • Splanchnic nerves through the inferior mesenteric plexus