Thigh Muscles

Question 1

Sartorius

Answer 1

O: ASIS (anterior superior iliac spine)

I: Medial surface of the upper tibia (pes anserine)

A: Flex thigh (hip), laterally rotate femur, flex leg (knee)

N: Femoral nerve (L2, L3)

Question 2

Quadriceps Femoris

Answer 2

O:

• rectus femoris: AIIS (anterior inferior iliac spine)
• vastus lateralis: linea aspera
• vastus medialis: linea aspera
• vastus intermedius: upper anterior femur

I: Tibial tuberosity via the patella

A: Extend leg (knee), flex femur (rectus femoris)

N: Femoral nerve (L2, L3, L4)

Question 3

Pectineus

Answer 3

O: Pubis

I: Linea aspera

A: Adduct and flex the femur

N: Femoral nerve

Question 4

Adductor Longus and Brevis

Answer 4

O: Pubis

I: Linea aspera

A: Adduct and flex femur

N: Obturator nerve

Question 5

Gracilis

Answer 5

O: Pubis

I: Medial upper tibia (pes anserine)

A: Adduct femur, flex leg (knee)

N: Obturator nerve

Question 6

Adductor Magnus

Answer 6

O: Pubis and ischium

I: Linea aspera, adductor tubercle

A: Adduct femur (adductor), extend femur (hamstring)

N: Obturator and sciatic nerves

(Adductor magnus has opening called the adductor hiatus, through which the femoral artery and vein pass)

Question 7

Semitendinosus

Answer 7

O: Ischial tuberosity

I: Upper medial tibia (pes anserine)

A: Extend femur (hip), flex and medially rotate leg (knee)

N: Tibial branch of sciatic nerve

Question 8

Semimembranosus

Answer 8

O: Ischial tuberosity

I: Medial condyle of tibia

A: Extend femur (hip), flex and medially rotate leg (knee)

N: Tibial branch of sciatic nerve

Question 9

Biceps Femoris

Answer 9

O: Long head: Ischial tuberosity. Short head: Linea aspera

I: Head of fibula

A: Long head: Extend femur (hip), flex and laterally rotate leg (knee). Short head: Flex and laterally rotate leg (knee).

N: Long head: Tibial branch of sciatic nerve. Short head: Common fibular branch of sciatic nerve.