Thigh Muscles

Question 1

What is the innervation and action of Biceps femoris:
Long head
Short head

Answer 1

Tibial division of
the sciatic nerve (long)

Common fibular
division of the
sciatic nerve (short)

Flexion of the leg
and extension of
the thigh

Question 2

What is the innervation and action of Adductor brevis

Answer 2

Obturator
nerve

Adduction of
Adductor brevis thigh

Question 3

What is the innervation and action of Adductor longus

Answer 3

Obturator
nerve

Adduction of
Adductor brevis thigh

Question 4

What is the innervation and action of Psoas major

Answer 4

Ventral rami
of L1 – L3

Flexion of the
thigh

Question 5

What is the innervation and action of Semimembranosus

Answer 5

Tibial division of
the sciatic nerve

Flexion of the leg
and extension of
the thigh

Question 6

What is the innervation and action of Pectineus

Answer 6

Femoral
nerve

Adduction and
flexion of thigh

Question 7

What is the innervation and action of Iliacus

Answer 7

Femoral
nerve

Flexion of the
thigh

Question 8

What is the innervation and action of Adductor magnus:
Adductor part
Hamstring part

Answer 8

Obturator
nerve (adductor)

Tibial division
of the sciatic
nerve (Hamstring)

Adduction of
the thigh

Question 9

What is the innervation and action of Semitendinosus

Answer 9

Tibial division of
the sciatic nerve

Flexion of the leg
and extension of
the thigh

Question 10

What is the innervation and action of Quadriceps femoris:
Vastus lateralis
Vastus medialis
Vastus intermedius
Rectus femoris

Answer 10

Femoral
nerve

Extension of
the leg
Flexion of the
thigh (rectus
femoris)

Question 11

What is the innervation and action of Gracilis

Answer 11

Obturator
nerve

Adduction of
thigh and
flexion of leg

Question 12

What is the innervation and action of Obturator externus

Answer 12

Obturator
nerve

Lateral rotation
of thigh