Deep Perineal Muscles

Question 1

Deep perineal muscles

Answer 1

1. Deep transversus perinei muscles
2. Sphincter urethrae (external sphincter of urethra)

Question 2

Deep transversus perinei muscles

Answer 2

1. Arise from ischial ramus
2. Run medial to end in perineal body, separating urogenital from anal triangles

Question 3

Sphincter urethrae

Answer 3

1. Consists of voluntary muscle fibers surrounding membranous urethra in male and upper part of urethra and vagina in female
2. Consists of 2 parts:
   - Inner circular fibers
   - Outer transverse fibers

Question 4

Inner circular fibers

Answer 4

Surrounds urethra

Question 5

Outer transverse fibers

Answer 5

Arise from pubic arch and diverge as running medial

Question 6

Nerve supply

Answer 6

All deep perineal muscles are supplied by perineal branch of pudendal nerve