Anatomy - Lower Limb

Question 1

Describe the origin and course of the sciatic nerve

Answer 1

Sacral plexus L4-S3 roots, join in the pelvis
Exits the pelvis under piriformis, through the greater sciatic notch
Travels under glute max, between greater trochanter and ischial tuberosity
Travels vertically down post thigh with hamstrings
Enters popliteal fossa, divides into tibial and common fibular nerves

Question 2

Ligaments of the hip

Answer 2

Iliofemoral - AIIS to intertrochanteric line
Pubofemoral - obturator crest to merge with iliofemoral
Ischiofemoral - ischial part of acetabulum to greater trochanter

Question 3

What does the sciatic nerve supply

Answer 3

Muscles of the posterior compartment of the thigh:

common fibular part - short head of biceps femoris

tibial part - long head of biceps femoris
semitendinosus
semimembranosus
hamstring portion of adductor magnus