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Flashcards in Muscles of the pelvic diaphragm Deck (17)
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1

What are the muscles of the pelvic diaphragm?

coccygeus M
levator ani M

2

What compose the levitator ani?

puborectalis,
pubococcygeus,
iliococcygeus MM.

3

Why is obturator internus important to the pelvic girdle

levator ani M originate in part from a tendinous arch that spans the obturator internus M on the medial side.

4

What is the origin and insertion of puborectalis?

origin -posterior face of medial pubis

insertion - onto itself wrapping around the rectum

5

What is the origin and insertion of pubococcygeus?

origin posterior face medial pubis, tendinous arch

insertion - anterior face of coccyx and sacrum

6

what is the origin and insertion of illiococcygeus?

origin- tendinous arch, ischial spine

insertion - lateral face of coccyx and anococcygeal ligament

7

What is the origin and insertion of Ischiococcygeus (coccygeus) ?

origin - ischial spine, sacrospinous ligament

insertion - lateral face of coccyx and adjacent border of sacrum

8

What is the action of puborectalis?

supports rectum,
assist in anal sphincters to prevent incontence

9

What is the action of pubococygeus?

supports pelvic organs,
helps control flow of urine
contracts during orgasm

10

What is the action of illiococcygeus?

supports pelvic organs

11

What is the action of ishiococcygeus?

supports pelvic organs
pulls coccyx forward after defection

12

What is the innervation of the pelvic diaghphragm MM?

levator ani S2-S4
Coccygeus S3-S5
direct branches of sacral spinal nerves

13

What does the relaxation of the puborectalis does?

assist rectal sphincters
allows anus and rectum to com in direct alignment assisting in defection

14

What are raphe in the pelvic diaphragm?

a seam where the two halves of muscle meet
keeps the contraction more spread out

15

What is internal sphincter?

part of the circular layer of the wall of the rectum

16

What causes the sphincters of the anus to contract?

sympayhetics from sacral splanchnics

17

What is the venous drainage of the rectum?

superior
middle- tributary to the common illiacs
inferior rectal veins - tributary to the common iliac