Chapter 11 Ankle and Foot Joints

Question 1

Gastrocnemius O&I

Answer 1

Origin: Medial head- posterior surface of the medial femoral condyle
Lateral head- Posterior surface of the lateral femoral condyle
Insertion: posterior surface of the calcaneous (Achilles tendon)

Question 2

Gastrocnemius Action

Answer 2

plantar flexion of the ankle, flexion of the knee

Question 3

Gastrocnemius Innervation

Answer 3

Tibial Nerve (S1, S2)

Question 4

Soleus O&I

Answer 4

Origin: posterior surface of the proximal fibula and proximal 2/3 of the posterior tibial surface
Insertion: posterior surface of the calcaneous (Achilles tendon)

Question 5

Soleus Action

Answer 5

plantar flexion of the ankle

Question 6

Soleus Innervation

Answer 6

Tibial Nerve (S1, S2)

Question 7

Tibialis Posterior O&I

Answer 7

Origin: posterior surface of the upper half of the interosseous membrane and the adjacent surfaces of the tibia and fibula
Insertion: inferior surfaces of the navicular, cuneiform, and cuboid bones and buses of the 2nd, 3rd, and 4th metatarsal bones

Question 8

Tibialis Posterior Action

Answer 8

inversion of the foot, plantar flexion of the ankle

Question 9

Tibialis Posterior Innervation

Answer 9

Tibial Nerve (L5, S1)

Question 10

Flexor Digitorum Longus O&I

Answer 10

Origin: middle 1/3 of the posterior surface of the tibia
Insertion: base of the distal phalanx of each of the four lesser toes

Question 11

Flexor Digitorum Longus Action

Answer 11

flexion of the four lesser toes at the metatarsophalangeal and the PIP and DIP joints, planter flexion of the ankle, inversion of the foot

Question 12

Flexor Digitorum Longus Innervation

Answer 12

Tibial Nerve (L5, S1)

Question 13

Flexor Hallicus Longus O&I

Answer 13

Origin: middle 2/3 of the posterior surface of the fibula
Insertion: Base of the distal phalanx of the great toe; plantar surface

Question 14

Flexor Hallicus Longus Action

Answer 14

flexion of the great toe at the MP and IP joints, plantar flexion of the ankle, inversion of the foot

Question 15

Flexor Hallicus Longus Innervation

Answer 15

Tibial Nerve (L5, S1, S2)

Question 16

Peroneus (fibularus) Longus O&I

Answer 16

Origin: head and upper 2/3 of the lateral surface of the fibula
Insertion: undersurfaces of the medial cuneiform and 1st metatarsal bone

Question 17

Peroneus (fibularus) Longus Action

Answer 17

eversion of the foot, plantar flexion of the ankle

Question 18

Peroneus (fibularus) Longus Innervation

Answer 18

Superficial Peroneal Nerve (L4, L5, S1)

Question 19

Peroneus (fibularis) Brevis O&I

Answer 19

Origin: Mid to lower 2/3 of the lateral surface of the fibula
Insertion: tuberosity of the 5th metatarsal bone

Question 20

Peroneus (fibularis) Brevis Action

Answer 20

eversion of the foot, plantar flexion of the ankle

Question 21

Peroneus (fibularis) Brevis Innervation

Answer 21

Superficial Peroneal Nerve (L4, L5, S1)

Question 22

Peroneus (fibularis) Tertius O&I

Answer 22

Origin: distal 1/3 of the anterior fibula
Insertion: Superior aspect of the base of the 5th metatarsal

Question 23

Peroneus (fibularis) Tertius Action

Answer 23

dorsiflexion of the ankle and eversion of the foot

Question 24

Peroneus (fibularis) Tertius Innervation

Answer 24

Deep Peroneal Nerve (L4, L5, S1)

Question 25

Externsor Digitorum Longus O&I

Answer 25

Origin: lateral condyle of the tibia, head o the fibula, and upper 2/3 of the anterior surface of the fibula Insertion: tops of the middle and distal phalanges of the four lesser toes

Question 26

Externsor Digitorum Longus Action

Answer 26

extension of the four lesser toes at the MP, PIP, and DIP joints dorsiflexion of the ankle, eversion of the foot

Question 27

Externsor Digitorum Longus Innervation

Answer 27

Deep Peroneal Nerve (L4, L5, S1)

Question 28

Extensor Hallicus Longus O&I

Answer 28

Origin: middle 2/3 of the medial surface of the anterior fibula Insertion: Base of the distal phalanx of the great toe

Question 29

Extensor Hallicus Longus Action

Answer 29

extension of the great toe at MP and IP joints | Dorsiflexion of the ankle, weak inversion of the foot

Question 30

Extensor Hallicus Longus Innervation

Answer 30

Deep Peroneal Nerve (L4, L5, S1)

Question 31

Tibialis Anterior O&I

Answer 31

Origin: upper 2/3 of the lateral surface of the tibia Insertion: inner surface of the medial cuneiform and the base of the 1st metatarsal bone

Question 32

Tibialis Anterior Action

Answer 32

dorsiflexion of the ankle, inversion of the foot

Question 33

Tibialis Anterior Innervation

Answer 33

Deep Peroneal Nerve (L4, L5, S1)