Pelvis and perineum 5.4

Question 1

Which structures make up the lateral pelvic walls (3)

Answer 1

-Sacrospinous and sacrotuberous ligaments.
-Obturator internus and piriformis muscles.
-Obturator foramen, membrane and fascia.

Question 2

Which structures make up the pelvic diaphragm?

Answer 2

-Coccygeus muscle.
-Levator ani muscles i.e. puborectalis, pubococcygeus and iliococcygeus muscles.

Question 3

Five venous plexuses of the pelvic area

Answer 3

-Vesical, prostatic, uterine, rectal, vaginal

Question 4

What are the pelvic nerves from the sacral plexus? (4) and their nerve roots (4).

Answer 4

-Sciatic nerve (L4-S3)
-Pudendal nerve (S2-S4)
-Superior gluteal nerve (L4-S1)
-Inferior gluteal nerve (L5-S2)

Question 5

Which structures are innervated by the pudendal nerve?

Answer 5

-Perineum, perineal muscles, sensory to genitalia, external anal and urethral sphincters.

Question 6

Which structures are innervated by the sciatic nerve?

Answer 6

Hip joint, flexors of the knee in thigh, all muscles of the leg and foot.

Question 7

Which structures are innervated by the superior and inferior gluteal nerves?

Answer 7

Sup- Gluteus medius and minumus.
Inf- Gluteus maximus.

Question 8

Function and nerve root of the:
a. Obturator nerve
b. Coccygeal plexus

Answer 8

a. Supplies muscles of medial thigh, L2-L4.
b. Supplies the coccygeus muscle, S4-S5.

Question 9

Name the somatic nerves of the pelvis. (7)

Answer 9

-Nerve to quadratus femoris.
-Nerve to obturator internus.
-Nerve to piriformis.
-Nerve to levator ani and coccygeus.
-Posterior femoral cutaneous
-Perforating cutaneous
-Pelvic splanchnic