The hip extensors

Question 1

what muscles form the hip extensors?

Answer 1

BF
Gluteal Maximus
Semimembranosus
Semitendinosus

Question 2

State the muscle attachments and actions of BF

Answer 2

Origin: long head-ischial tuberosity
Short head- linea aspera and supracondylar ridge

Flexes the knee and laterally rotates the knee. The long head extends the hip

Question 3

The muscle attachments and actions of gluteal Maximus

Answer 3

Origin: posterior outer surface of ilium, sacrum and coccyx
Insertion: iliotibial band and gluteal tuberosity of femur

Extends the trunk and thigh and laterally rotates the thigh

Question 4

Muscle attachments and action of semimembranosus

Answer 4

Origin: ischial tuberosity
Insertion: posterior aspect of the medial tibial condyle

Extends the hip, flexes and medially rotates the knee

Question 5

Muscle attachments and action of semitendinosus

Answer 5

Ischial tuberosity and insertion is from medial surface of the proximal tibia

Extends the hip and flexes and medially rotates the knee

Question 6

State the nerve supply of these muscles

Answer 6

Semimembranosus and semitendinosus have the sciatic nerve supply of L5, S1 and S2
BF sciatic nerve L5, S1-S3
Gluteal Maximus inferior gluteal nerve L5, S1, S2