LM 6.1: Lumbosacral Plexus

Question 1

What are the 3 bones of the hip?

Answer 1

1. Ilium
2. Ischium
3. Pubis

Question 2

Where does the head of the femur articular with the hipe bone?

Answer 2

Acetabulum

Question 3

What is the importance of the greater sciatic foramen?

Answer 3

It allows for the nerves of the sacral plexus to exit the pelvis and travel to the gluteal region and to the rest of the lower limb inferiorly

Question 4

What does the inguinal ligament run between?

Answer 4

The anterior superior iliac spine and the pubic tubercle

It serves as a demarcation between the abdomen and pelvis superiorly and the lower limb inferiorly

Question 5

What does the iliac crest mark?

Answer 5

Between the gluteal region inferiorly and the trunk superiorly

Question 6

What are the roots of the lateral cutaneous nerve of the thigh?

Answer 6

L2-L3

Lumbar plexus

Question 7

What is the iliopsoas muscle comprised of?

Answer 7

1. Iliacus muscle
2. Psoas major muscle

The iliopsoas muscle attaches distally to the lesser trochanter of the femur = it’s a strong flexor of the hip joint!

Question 8

What muscle does the sacral plexus lie on top of?

Answer 8

The piriformis muscle