Muscles of the Pelvic Wall and Floor

Question 0

Origin of Levator Ani

Answer 0

Body of Pubis
Tendinous Arch of Levator Ani
Ischial Spine

Question 1

Levator Ani

Answer 1

Pubococcygeus and Iliococcygeus

Question 2

Insertion of Levator Ani

Answer 2

Perineal Body
Coccyx
Anococcygeal Ligament
Walls of Prostate or Vagina
Rectum
Anal Canal

Question 3

Innervation of Levator Ani

Answer 3

Nerve to Levator Ani (branches of S4)
Inferior Anal (Rectal) Nerve
Coccygeal Plexus

Question 4

Actions of Levator Ani

Answer 4

Helps support pelvic viscera

Resists increase in intra-abdominal pressure

Question 5

Coccygeus

Answer 5

Ishiococcygeus

Question 6

Origin of Coccygeus

Answer 6

Ischial Spine

Question 7

Insertion of Coccygeus

Answer 7

Inferior end of Sacrum and Coccyx

Question 8

Innervation of Coccygeus

Answer 8

Branches of S4 and S5 nerves

Question 9

Actions of Coccygeus

Answer 9

Forms small part of Pelvic Diaphragm that supports pelvic viscera
Flexes Coccyx

Question 10

Origin of Obturator Internus

Answer 10

Pelvic surface of Ilium and Ischium

Obturator Membrane

Question 11

Insertion of Obturator Internus

Answer 11

Greater Trochanter of Femur

Question 12

Innervation of Obturator Internus

Answer 12

Nerve to Obturator Internus

L5 S1 S2

Question 13

Actions of Obturator Internus

Answer 13

Laterally Rotates hip joint

Assists in holding Head of Femur in Acetabulum

Question 14

Origin of Piriformis

Answer 14

Pelvic surface of 2nd-4th Sacral segments
Superior margin Greater sciatic notch
Sacrotuberous ligament

Question 15

Insertion of Piriformis

Answer 15

Greater Trochanter of Femur

Question 16

Innervation of Piriformis

Answer 16

Anterior Rami of S1 and S2

Question 17

Actions of Piriformis

Answer 17

Laterally rotates hip joint
Abducts hip joint
Assists in holding Head of Femur in Acetabulum