Extrinsic muscles of foot

Question 1

Origin of gastocnemius?

Answer 1

Medial head: Medial supracondylar ridge of femur and adductor tubercle of femur
Lateral head: Lateral condyle of femur

Question 2

Insertion of gastrocnemius?

Answer 2

Posterior calcaneus via the calcaneal (Achilles) tendon

Question 3

Action of gastrocnemius?

Answer 3

Knee flexion and plantarflexion of foot

Question 4

Innervation of gastrocnemius?

Answer 4

Tibial nerve (S1-S2)

Question 5

Origin of soleus?

Answer 5

Soleal line of tibia and posterior upper third of fibula

Question 6

Insertion of soleus?

Answer 6

Posterior calcaneus via the calcaneal (Achilles) tendon

Question 7

Action of soleus?

Answer 7

Plantarflexion of foot

Question 8

Innervation of soleus?

Answer 8

Tibial nerve (S1-S2)

Question 9

Origin of tibialis posterior?

Answer 9

Proximal posterior tibia and fibula, interosseous membrane

Question 10

Insertion of tibialis posterior?

Answer 10

Tuberosity of navicular, medial cuneiform, and expansions to all tarsal bones except the talus

Question 11

Action of tibialis posterior?

Answer 11

Plantarflexion and inversion of intertarsal joint of foot

Question 12

Innervation of tibialis posterior?

Answer 12

Tibial nerve (L4-L5)

Question 13

Origin of flexor hallucis longus?

Answer 13

Inferior 2/3’s of posterior fibular shaft

Question 14

Insertion of flexor hallucis longus?

Answer 14

Plantar surface of distal phalanx of great toe

Question 15

Action of flexor hallucis longus?

Answer 15

Plantarflexion of foot, flexes the distal phalanx of great toe at the interphalangeal joint, and the proximal phalanx of great toe at the metatarsophalangeal joint

Question 16

Origin of flexor digitorum longus?

Answer 16

Middle third of posterior tibia

Question 17

Innervation of flexor hallucis longus?

Answer 17

Tibial nerve (S1-S2)

Question 18

Insertion of flexor digitorum longus?

Answer 18

Distal phalanges of toes II-V

Question 19

Action of flexor digitorum longus?

Answer 19

Plantarflexion of the foot, flexion of distal and intermediate phalanges II-V at interphalangeal joints, flexion of proximal phalanx II-V at metatarsophalangeal joints

Question 20

Innervation of flexor digitorum longus?

Answer 20

Tibial nerve (L5-S2)

Question 21

Origin of tibialis anterior?

Answer 21

Proximal 2/3’s of lateral tibia and interosseous membrane

Question 22

Insertion of tibialis anterior?

Answer 22

Dorsal medial surface of medial cuneiform and base of 1st metatarsal

Question 23

Action of tibialis anterior?

Answer 23

Dorsiflexion of foot and inversion of foot at intertarsal joints

Question 24

Innervation of tibialis anterior?

Answer 24

Deep fibular (peroneal) nerve (L4-L5)

Question 25

Origin of extensor hallucis longus?

Answer 25

Anterior middle third of fibula and interosseous membrane

Question 26

Insertion of extensor hallucis longus?

Answer 26

Dorsal surface of distal phalanx of great toe

Question 27

Action of extensor hallucis longus?

Answer 27

Dorsiflexion of foot and extension of proximal phalanx of great toe at metatarsophalangeal joint

Question 28

Innervation of extensor hallucis longus?

Answer 28

Deep fibular (peroneal) nerve (L5-S1)

Question 29

Origin of extensor digitorum longus?

Answer 29

Lateral tibial condyle, anterior surface of fibula, and interosseous membrane

Question 30

Insertion of extensor digitorum longus?

Answer 30

Distal and middle phalanges of toes II-V

Question 31

Action of extensor digitorum longus?

Answer 31

Dorsiflexion of foot, extension of distal and middle phalanges II-V at interphalangeal joints, extension of proximal phalanx II-V at metatarsophalangeal joints

Question 32

Innervation of extensor digitorum longus?

Answer 32

Deep fibular (peroneal) nerve (L5-S1)

Question 33

Origin of peroneus longus?

Answer 33

Head and body of fibula

Question 34

Insertion of peroneus longus?

Answer 34

Inferior surface of medial cuneiform and base of inferior first metatarsal

Question 35

Action of peroneus longus?

Answer 35

Plantarflexion at ankle joint and eversion of the foot

Question 36

Innervation of peroneus longus?

Answer 36

Superficial peroneal nerve (L5-S1)

Question 37

Origin of peroneus brevis?

Answer 37

Distal half of body of fibula

Question 38

Insertion of peroneus brevis?

Answer 38

Tuberosity of the base of the 5th metatarsal

Question 39

Action of peroneus brevis?

Answer 39

Plantarflexion at ankle joint and eversion at subtalar joint

Question 40

Innervation of peroneus brevis?

Answer 40

Superficial peroneal nerve (L5-S1)