3. The muscles in the liac region _________________________________. cross anter

Question

3. The muscles in the liac region _________________________________.

cross anterior to the hip joint and therefore are limited to flexion of the thigh

have actions on both the pelvis and hip joint

have a common insertion onto the trochanters

when denervated cause pelvic tilt in the ventral plane

4. What are the spinal segments and motor functions of the sciatic nerve?

a. L1-5; Thigh flexion via the quadriceps femoris that are innervated  by the sciatic nerve itself before it dividies into the tibial and common peroneal nerve.

b. L4, 5, S1-3; Leg flexion at the knee via the hamstring muscles, semitendinosus, semimembranosus, and biceps femoris) that are innervated by the sciatic nerve itself before it dividies into the tibial and common peroneal nerve.

c. S2,3,4; Thigh extension by innervating the gluteus muscles before descending into the posterior thigh.

d. L6, 7, S1-3; Leg flexion at the knee via the hamstring muscles, semitendinosus, semimembranosus, and biceps femoris) that are innervated by the sciatic nerve itself before it dividies into the tibial and common peroneal nerve.

cross anterior to the hip joint and therefore are limited to flexion of the thigh

have actions on both the pelvis and hip joint

have a common insertion onto the trochanters

when denervated cause pelvic tilt in the ventral plane

Explanation / Answer

3. The muscles of the iliac region include Psoas major, Psoas minor, and Iliacus. The muscles of the iliac region have a common insertion onto the trochanters. So, the correct option is option C, have a common insertion onto the trochanters.

4. Sciatic nerve is made of 5 nerves that exist the spine between two vertebral segments. The spinal segments of sciatic nerve are L4, L5, S1, S2, and S3. Sciatic nerve innervates the posterior thigh muscles and the hamstring portion of the adductor magnus. It divides into two nerves in the lower thigh known as the peroneal nerves and the tibial nerves. Sciatic nerve helps in leg flexion at the knee. So, the correct option is option B, L4, 5, S1-3; Leg flexion at the knee via the hamstring muscles (semitendinosus, semimembranous, and biceps femoris) that are innervated by the sciatic nerve itself before it divides into the tibial and common peroneal nerve.

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