Muscles of Pelvic Wall And Floor

Question 1

Boundary of the Obturator internus?

Answer 1

Lateral Wall

Question 2

Proximal Attachment (Origin) of the Obturator internus?

Answer 2

• Pelvic surface of ilium and ischium

- Obturator membrane

Question 3

Distal Attachment (Insertion) of the Obturator internus?

Answer 3

Greater Trochanter of femur

Question 4

Innervation of the of the Obturator internus?

Answer 4

Nerve to obturator muscle (l5, S1, S2)

Question 5

Main action of the of the Obturator internus?

Answer 5

• Rotates thigh laterally.

- Assists in holding head of femur in acetabulum

Question 6

Boundary of the Piriformis?

Answer 6

Posterosuperior wall

Question 7

Proximal Attachment (Origin) of the Piriformis?

Answer 7

• Pelvic surface of S2-S4 segments

- Superior Margin of greater sciatic notch and sacrotuberous ligament

Question 8

Distal Attachment (Insertion) of the Piriformis?

Answer 8

Greater Trochanter of femur

Question 9

Innervation of the of the Piriformis?

Answer 9

Anterior rami of S1 and S2

Question 10

Main action of the of the Piriformis?

Answer 10

• Rotates thigh laterally
• Abducts thigh
• Assists in holding head of femur in acetabulum

Question 11

Boundary of the Coccygeus (ischiococcygeus)?

Answer 11

Floor

Question 12

Proximal Attachment (Origin) of the Coccygeus (ischiococcygeus)?

Answer 12

Ischial Spine

Question 13

Distal Attachment (Insertion) of the Coccygeus (ischiococcygeus)?

Answer 13

Inferior End of sacrum and coccyx

Question 14

Innervation of the of the Coccygeus (ischiococcygeus)?

Answer 14

Branches of S4 and S5 spinal nerves

Question 15

Main action of the of the Coccygeus (ischiococcygeus)?

Answer 15

• Forms small part of pelvic diaphragm that supports pelvic viscera
• Flexes coccyx

Question 16

What muscles make up the Levator ani?

Answer 16

• Puborectalis
• Pubococcygeus
• Iliococcygeus

Question 17

Boundary of Levator ani?

Answer 17

Floor

Question 18

Proximal Attachment (Origin) of the Levator ani?

Answer 18

• Body of pubis
• Tendinous arch of obturator fascia
• Ischial spine

Question 19

Distal Attachment (Insertion) of the Levator ani?

Answer 19

• Perineal body
• coccyx
• anococcygeal ligament
• walls of prostate or vagina, rectum and anal canal

Question 20

Innervation of the of the Levator ani?

Answer 20

Nerve to levator ani (branches of S4), inferior anal (rectal) nerve, and coccygeal plexus

Question 21

Main action of the of the Levator ani?

Answer 21

Forms most of pelvic diaphragm that helps support pelvic viscera and resists increases in intra-abdominal pressure