Innervation and actions of mms of thigh

Question 1

sartorius

Answer 1

act: flexes, abducts and LAT rotates thigh at the hip jt and flexes and assists MED ROT at knee jt
n: femoral

Question 2

rectus femoris

Answer 2

act: EXT at knee and FLEX at hip jt
n: femoral

Question 3

vastus lateralis

Answer 3

act: EXT at knee and strengthens knee jt
n: femoral

Question 4

vastus medialis

Answer 4

act: EXT at knee and strengthens knee jt
n: femoral

Question 5

vastus intermedius

Answer 5

act: EXT of the knee
n: femoral

Question 6

articularis genu

Answer 6

act: pulls the articular capsule up during knee EXT to avoid pinching the capsule under the patella
n: femoral

Question 7

pectineus

Answer 7

act: adducts and flexes thigh at the hip jt
n: femoral and obturator n

Question 8

biceps femoris

Answer 8

act: flexes and LAT ROT leg at knee jt and the long head extends and assists w/ LAT ROT of thigh at the hip jt
n. (long HD): sciatic nerve - tibial portion
n. (short HD): sciatic nerve - common peroneal portion

Question 9

semitendinosus

Answer 9

act: flexes and MED rotates leg at the knee jt and extends and assists w/ MED ROT of thigh at the hip jt
n: sciatic n- tibial portion

Question 10

semimembranosus

Answer 10

act: flexes and MED rotates leg at the knee jt and extends and assists w/ MED ROT of thigh at the hip joint
n: sciatic n- tibial portion

Question 11

gracilis

Answer 11

act: adducts thigh at the hip jt, assists FLEX and MED ROT of leg at knee jt

Question 12

adductor magnus

Answer 12

act (adductor portion): adducts thigh at hip jt
act (hamstring portion): extends thigh at hip jt
n. (adductor portion): obturator nerve
n. (hamstring portion): sciatic nerve

Question 13

adductor longus

Answer 13

act: adducts thigh at hip jt
n: obturator n

Question 14

adductor brevis

Answer 14

act: adducts thigh at hip jt
n: obturator n