MUSCLES OF THE PELVIC DIAPHRAGM

Question 1

what are the muscles of the pelvic diaphragm?

Answer 1

levator ani muscles

Question 2

what comprises the levator ani muscles?

Answer 2

pubococcygeus m
iliococcygeus m
puborectalis m

Question 3

what is the origin of the levator ani m.

Answer 3

posterior aspect of the pubic body, the tendinous
arch of the levator ani muscles (a specialized
thickening of the obturator fascia), and the ischial
spine

Question 4

what is the insertion of the levator ani m.

Answer 4

anococcygeal raphe /

anococcygeal ligament

Question 5

action of the levator ani muscles

Answer 5

Acting together these
three muscles support
the pelvic viscera and
raise the pelvic floor.
They resist intraabdominal
pressure and are important in forced expiration, coughing, vomiting, urination, and defecation.

Question 6

levator ani m arterial supply

Answer 6

inferior rectal a. via internal

pudendal a.

Question 7

levator ani m inervation

Answer 7

innervation from S-4, the
inferior rectal nerve (branch
of the pudendal nerve), and
the coccygeal plexus

Question 8

coccygeus m origin

Answer 8

ischial spine

Question 9

coccygeus m insertion

Answer 9

inferior end of the sacrum

and coccyx

Question 10

coccygeus m action

Answer 10

Supports the pelvic
viscera. Flexes the
coccyx, important in
defecation.

Question 11

coccygeus m arterial supply

Answer 11

inferior rectal a. via internal

pudendal a.

Question 12

coccygeus m innervation

Answer 12

S-4 and S-5 and inferior rectal nerve (branch of the

pudendal nerve)