Pelvic muscles (dave's notes) Flashcards Preview

Anatomy: pelvis and perineum (based on Dave's notes only so far) > Pelvic muscles (dave's notes) > Flashcards

Flashcards in Pelvic muscles (dave's notes) Deck (23):
1

What is the origin of obturator internus?

The inner surface of the obturator membrane, the rim of the pubis and the ischium bordering it (what?)

2

What is the origin of piriformis?

S2,3,4 of the costotransverse bars of anterior ant sacrum between the sacral foramina

3

What three muscles constitute the pelvic floor?

Coccygeus: ischiococcygeus, levator ani: iliococcygeus, levator ani: pubococcygeus

4

What is the origin of coccygeus: ischiococcygeus?

The sacrospinous ligament and ischial spine

5

What is the origin of levator ani: iliococcygeus?

The posterior half of the white line and ischial spine

6

What is the origin of levator ani: pubococcygeus?

The anterior half of the white line and the posterior part of pubis

7

What is the insertion of obturator internus?

The middle part of the medial aspect of the greater trochanter of femur

8

What is the insertion of piriformis?

The anterior part of the medial aspect of the greater trochanter

9

What is the insertion of coccygeus: ischiococcygeus?

The anococcygeal body and coccyx

10

What is the insertion of levator ani: iliococcygeus?

The anococcygeal body

11

What is the insertion of levator ani: pubococcygeus?

The anococcygeal body

12

What is the action of obturator internus?

Laterally rotates and stabilises the hip

13

What is the action of piriformis?

Laterally rotates and stabilises the hip

14

What is the action of coccygeus: ischiococcygeus?

Supports pelvic viscera

15

What is the action of levator ani: iliococcygeus?

Supports pelvic viscera

16

What is the action of levator ani: pubococcygeus?

Supports pelvic viscera

17

What is the nerve supply to obturator internus?

The nerve of obturator internus (L5, S1,2)

18

What is the nerve supply to piriformis?

The tibial nerve (S1,2)

19

What is the nerve supply to coccygeus: ischiococcygeus

S4,5

20

What is the nerve supply to levator ani: iliococcygeus

S3,4

21

What is the nerve supply to levator ani: pubococcygeus

S3,4

22

What is found on the surface of piriformis?

Emerging nerves and plexus lies on the muscle. Piriformis (or the nerves??) run transversely to the greater sciatic foramen

23

What is notable about the attachments of levator ani: iliococcygeus?

It does not attach to the ilium
Why is this notable??