Muscle innervation

Question 1

External anal sphincter

Answer 1

Pudendal nerve (S2-S4) inferior rectal branch

Question 2

Obturator internus

Answer 2

Nerve to obturator internus (L5, S1)

Question 3

Piriformis

Answer 3

Nerve to piriformis (S1, S2)

Question 4

Coccygeus

Answer 4

S4, S5 branches from sacral plexus

Question 5

Pubococcygeus

Answer 5

Pudendal nerve

Nerve to levator ani

Question 6

Puborectalis

Answer 6

Pudendal nerve

Nerve to levator ani

Question 7

Iliococcygeus

Answer 7

Pudendal nerve

Nerve to levator ani

Question 8

Iliacus

Answer 8

Femoral nerve (L2, L3)

Question 9

Psoas major

Answer 9

Anterior rami L1-L3

Question 10

Pectineus

Answer 10

Femoral nerve (L2, L3)

Question 11

Sartorius

Answer 11

Femoral nerve (L2, L3)

Question 12

Quadriceps:
Rectus femoris
Vastus lateralis
Vastus medialis
Vastus intermedius

Answer 12

Femoral nerve (L2, L3, L4)

Question 13

Gracilis

Answer 13

Obturator (L2, L3)

Question 14

Adductor Longus

Answer 14

Obturator (L2, L3, L4)

Question 15

Adductor Brevis

Answer 15

Obturator (L2, L3, L4)

Question 16

Adductor magnus

Answer 16

Obturator (L2, L3, L4)

Question 17

Obturator Externus

Answer 17

Obturator (L3, L4)

Question 18

Gluteus Maximus

Answer 18

Inferior gluteal nerve (L5, S1, S2)

Question 19

Tensor Fasciae Latae

Answer 19

Superior gluteal nerve (L4, L5, S1)

Question 20

Gluteus medius

Answer 20

Superior gluteal nerve (L4, L5, S1)

Question 21

Gluteus minimus

Answer 21

Superior gluteal nerve (L4, L5, S1)

Question 22

Superior gemeli

Answer 22

Nerve to obturator internus

Question 23

Inferior gemeli

Answer 23

Nerve to quadratus femoris

Question 24

Quadratus femoris

Answer 24

Nerve to quadratus femoris (L5, S1)

Question 25

Semitendinosus

Answer 25

Tibial division of sciatic (L5, S1, S2)

Question 26

Semimembranosus

Answer 26

Tibial division of sciatic (L5, S1, S2)

Question 27

Long head of biceps femoris

Answer 27

Tibial division of sciatic (L5, S1, S2)

Question 28

Short head of biceps femoris

Answer 28

Common peroneal division of sciatic (L5, S1, S2)

Question 29

Peroneus Longus

Answer 29

Superficial peroneal nerve (L5, S1, S2)

Question 30

Peroneus Brevis

Answer 30

Superficial pernoeal nerve (L5, S1, S2)

Question 31

Tibialis anterior Extensor digitorum longus Peroneus tertius Extensor hallucis longus

Answer 31

Deep peroneal nerve (L4, L5)

Question 32

Extensor hallucis brevis | Extensor digitorum brevis

Answer 32

Deep peroneal nerve (L5, S1)

Question 33

Gastrocnemius Plantaris Soleus

Answer 33

Tibial nerve (S1, S2)

Question 34

Popliteus

Answer 34

Tibial nerve (L4, L5, S1)

Question 35

Flexor digitorum longus | Flexor hallucis longus

Answer 35

Tibial nerve (L5, S1, S2)

Question 36

Tibialis posterior

Answer 36

Tibial nerve (L4, L5)

Question 37

Abudctor hallucis Flexor digitorum brevis 1st lumbrical Flexor hallucis brevis

Answer 37

Medial plantar nerve (S2, S3)

Question 38

All other foot muscles

Answer 38

Lateral plantar nerve (S2, S3)