Adductors and posterior thigh innervation and action

Question 1

Adductor longus

Answer 1

Innervation:  L2-L3-L4
                      Obturator nerve (anterior division)
Action:  Adducts and medially rotates thigh at hip joint

Question 2

Gracilis

Answer 2

Innervation: L2-L3
Obturator nerve
Action: Adducts thigh at hip joint
Flexes leg at knee joint

Question 3

Adductor magnus

Answer 3

Adductor portion:
Innervation: L2-L3-L4
Obturator nerve
Action: Adducts and medially rotates thigh at hip joint

Hamstring portion:
Innervation: L2-L3-L4
Sciatic nerve (tibial division)
Action: Adducts thigh and medially rotates thigh at hip

Question 4

Semi-membranosus

Answer 4

Innervation: L5-S1-S2
Sciatic nerve (tibial division)
Action: Flexes leg at knee
Extends thigh at hip
Medially rotates thigh at hip and leg at knee

Question 5

Semi-tendinosus

Answer 5

Innervation: L5-S1-S2
Sciatic nerve (tibial division)
Action: Flexes leg at knee
Extends thigh at hip
Medially rotates thigh at hip and leg at knee

Question 6

Biceps femoris

Answer 6

Innervation: L5-S1-S2
Sciatic nerve
Action: Flexes and laterally rotates leg at knee
Extends and laterally rotates thigh at hip