10- Muscles of the Pelvic Diaphragm

Question 1

Levator Ani

Answer 1

Broad, thin, tripartite muscle. its fibers extend inferomedially, forming a muscular : sling: around male prostate or vagina, urethra, and anorectal junction before meeting in the median plane.

Supports and maintains position of pelvic viscera; resists downward thrusts that accompany rises in intrapelvic pressure during coughing. Forms sphincters at anorectal junction and vagina; lifts anal canal during defecation.

Question 2

Coccygeus

Answer 2

Small triangular muscle lying posterior to levator ani; forms posterior part of pelvic diaphragm.

Supports pelvic viscera; supports coccyx and pulls it forward after it has been reflected posteriorly by defecation and childbirth.