Pelvic floor muscles Flashcards Preview

Repro anatomy > Pelvic floor muscles > Flashcards

Flashcards in Pelvic floor muscles Deck (32)
Loading flashcards...
1

what are the 3 muscular components of the pelvic floor?

Levator ani muscles
Coccygeus muscle
Fascia coverings of the muscles

2

which is the largest muscular component of the pelvic floor?

Levator ani muscles

3

what are the levator ani muscles innervated by? nerve roots?

Innervated by branches of the pudendal nerve, roots S2, S3 and S4

4

what is the levator ani muscle?

a broad sheet of muscle

5

what is the levator ani muscle composed of?

three separate paired muscles, called the pubococcygeus, puborectalis and iliococcygeus

6

where do the levator ani muscles have attachments?

Anterior
Laterally
Posteriorly

7

what is the anterior attachment of the levator ani muscle?

The pubic bodies of the hip bone

8

what is the lateral attachment of the levator ani muscle?

Thickened fascia of the obturator internus muscle, known as the tendinous arch

9

what is the posterior attachment of the levator ani muscle?

The ischial spines of the hip bone

10

what is the puborectalis muscle?

a U-shaped sling

11

where does the puborectalis muscle extend?

from the bodies of the pubic bones, past the urogenital hiatus, around the anal canal

12

what does tonic contraction of the puborectalis muscles lead to?

bends the canal anteriorly, creating the anorectal angle at the anorectal junction

13

what is the anorectal junction?

where the rectum meets the anus

14

what is the anorectal angle?

90 degrees

15

what is the main function of the puborectalis muscle?

The main function of this thick muscle is to maintain faecal continence

16

what happens to the puborectalis muscle during defecation?

muscle relaxes

17

what are the muscle fibres of the pubococcygeus muscle the main constituent of?

of the levator ani

18

where do the muscle fibres of the pubococcygeus muscle arise from?

from the body of the pubic bone and the anterior aspect of the tendinous arch

19

where do the muscles fibres of the pubococcygeus muscle travel?

The fibres travel around the margin of the urogenital hiatus and run posteriomedially

20

where do the muscle fibres of the pubococcygeus muscle attach to?

attaching at the coccyx and anococcygeal ligament

21

what happens to the muscle fibres of the pubococcygeus muscle as it travels inferiorly and medially?

some fibres divide and loop around the prostate in males and around the vagina in females

22

where do some fibres of the pubococcygeus muscle terminate?

in the perineal body

23

what are the muscle fibres of the pubococcygeus muscle called as it loops around the prostate in males?

levator prostatae

24

what are the muscle fibres of the pubococcygeus muscle called as it loops around the vagina in females?

pubovaginalis

25

what does the iliococcygeus muscle contain?

has thin muscle fibres, which start anteriorly at the ischial spines and posterior aspect of the tendinous arch

26

where do the thin muscle fibres of the iliococcygeus muscle begin?

start anteriorly at the ischial spines and posterior aspect of the tendinous arch

27

where do the thin muscle fibres of the iliococcygeus muscle attach?

They attach posteriorly to the coccyx and the anococcygeal ligament

28

what is the Coccygeus muscle innervated by?

Innervated by the anterior rami of S4 and S5

29

what is the coccygeus muscle?

the smaller, and most posterior, pelvic floor component

30

where are the levator ani muscles situated?

The levator ani muscles situated anteriorly