Muscles and Passageways of the pelvis (24)

Question 1

Lateral Wall

Answer 1

Two lateral rotators of the thigh origninate from bony pelvis and insert on the greater trochanter of the femur.
both are innervated by muscular branches of sacral plexus

Question 2

Obturator Internus m.

Answer 2

medial surface covered by obturator fascia

tendons exit the pelvis via the lesser sciatic foramen to insert onto femur

Question 3

Piriformis m.

Answer 3

site of sacral plexus

tendons exit the pelvis via the greater sciatic foramen to insert onto femur

Question 4

Pelvic Floor - formed by pelvic diaphragm

Answer 4

a bowl-shaped group of skeletal muscles that partially closes off the pelvic outlet and supports that abdominopelvic viscera, especially when intra-abdominal pressure is raised (e.g. during coughing or straining)

Question 5

Coccygeus

Answer 5

pulls coccyx anteriorly and supports pelvic viscera; wags tail in other mammals

Question 6

Levator ani

Answer 6

elevates the pelvic floor to resist and/or raise intra-abdominal pressure (important for forced expiration, coughing or vomiting)

Question 7

Obturator Canal

Answer 7

connects the abdominopelvic region with medial compartment of thigh

Transmits obturator n.a.v.

Question 8

Greater Sciatic foramen

Answer 8

Connects pelvic cavity with gluteal region

Piriformis n. exits here

Superior gluteal n.a.v. pass superiorly to piriformis m., inferior gluteal n.a.v and pudendal nerve pass inferior to the piriformis m.

Question 9

Lesser Sciatic foramen

Answer 9

connects gluteal region with perineum

Tendon of obturator interns m. exits pelvis here