Perineum 1

Question 1

Lateral margins of perineum

Answer 1

Formed anteriorly by ischiopubic rami and sacrotuberous ligaments posteriorly.

Question 2

Anatomical position of triangles

Answer 2

Urogenital: horizontal plane
Anal: tilted upward at transtubercular line, faces more post
-triangles not in same plane

Question 3

Roof of perineum

Answer 3

Levator ani muscles: separate pelvic cavity above from perineum.
-form cone shaped pelvic diaphragm

Question 4

Urogenital hiatus

Answer 4

U shaped defect in urogenital triangle, allows passage of urethra and vagina.

Question 5

Perineal membrane

Answer 5

• thick fibrous sheet that fills urogenital triangle

- free post border, anchored in midline to perineal body and attached laterally to pubic arch

Question 6

Deep perineal pouch

Answer 6

• superior to perineal membrane
• contains layer of skeletal muscle and neurovasc tissues
• external urethral sphincter

Question 7

Peripheral boundary

Answer 7

pelvic outlet

Question 8

Ceiling

Answer 8

pelvic diaphragm (levator ani and coccygeus muscles)

Question 9

Margin of perineum

Answer 9

Marked by inferior border of pubic symphysis at ant pt, tip of coccyx at post pt, ischial tuberosities at lat pt