Muscles of the pelvis Flashcards Preview

Endocrine and Reproductive system > Muscles of the pelvis > Flashcards

Flashcards in Muscles of the pelvis Deck (11)
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1
Q

what muscles line the lateral pelvic walls

where do they attach

A

obturator interns and pirifromis

greater trochanter of femur

2
Q

what muscles form the pelvic diaphragm

A

levator ani and coccygeus

3
Q

what muscles form the levator ani

A

pubococcygeus
puborectalis
iliococcygeus

4
Q

function of obturator internus

A

rotates extended thigh laterally - abducts flexed thigh at hip

5
Q

function of piriformis

A

rotates extended thigh laterally and abducts flexed thigh and stabilises hip joint

6
Q

functions of levator ani muscles

A

supports pelvic viscera

raises pelvic floor

7
Q

function of coccygeus

A

supports pelvic viscera and draws the coccyx forward

8
Q

innervation of levator ani muscles

A

anterior rami of S3-S4 perineal nerve of the pudendal nerve

9
Q

innervation of coccygeus

A

anterior rami of S4-S5

10
Q

if the levator ani muscles are injured what two clinical conditions can occur

A

urinary and fecal incontince and prolapsed the uterus

11
Q

the normal angle between the rectum and anal canal is 90 degrees but during defecation when the anal canal wings forward what does this angle change to

A

40-50 degrees

relaxation of the muscles and anal sphincter opens the anal canal