Anatomy: Pelvis

Question 1

What makes up the pelvic cavity?

Answer 1

hip bones anterior laterally and sacrum post.

Question 2

What composes the pelvic brim?

Answer 2

pelvic inlet/sup. pelvic aperture

Question 3

What divides the pelvic cavity into two parts?

Answer 3

pelvic brim via:

1) Ture (lesser pelvis)
2) False (greater) pelvis which is continuos with the abdom cavity

Question 4

At what spinal level does the pelvic cavity start?

Answer 4

L3 and below

Question 5

What are the components of the Superior pelvic aperture? What does it separate?

Answer 5

1) sacral promontory
2) ant. border of sacral ala
3) Terminal line: (arucate line; iliopubic eminence/iline); pecten of the pubis
4) pubic symphysis
- - separates the true and false pelvis

Question 6

What type of joint is the SI joint?

Answer 6

synovial planar / gliding jt

Question 7

What type of joint is the symphysis pubis?

Answer 7

secondary synchondrosis jt b/c bodies of pubic bones

- articular surface covered with hyaline with layer of fibrocartilage b/w

Question 8

What are the 7 lig that attach to the pelvis?

Answer 8

1) Ant sacro iliac
2) post sacro iliac (strongest lig in body very hard to cut it)
3) sacro-spinous
4) Sacro-tuberouse
5) ilio-lumbar (L4-ilium)
6) ant longitudinal
7) interosseous sacro-iliac

Question 9

What is the O/I/N/F of levator ani?

Answer 9

ORI: post surface of sup ramus of pubis (puborectalis and pubococcygeous); inner surface of spine of ischium; and b/w these two points, from the tendinous arch of obturator fascia (ilioccygeous)
INS: most post fibers to coccyx; ant unite with muscle of opposite side; middle side of rectum
N: S4
FUN: constricts lower end of rectum and vagina. elevates lower end of rectum

Question 10

What is the OINF of coccygeus?

Answer 10

ORI: spine of ischium
INS: coccyx
N: S4-5

Question 11

What nerve controls the: superficial transverse perinea; bulbospongiousus; ischocav; deep transverse perinei

Answer 11

Pudendal nerve (L4-S2)