Anterior and Lateral Leg and Dorsum of Foot.

Question 1

Where is the interosseous membrane?

Answer 1

Between the tibia and fibula

Question 2

What is the function of the interosseous membrane?

Answer 2

• Surface of muscle attachment
• Resist downward pull of muscles attached to fibula

Question 3

What type of joint is the superior tibiofibular joint?

Answer 3

Plane synovial joint

Question 4

Where does the superior tibiofibular joint lie?

Answer 4

Head of fibula and facet on lateral tibial condyle

Question 5

What movement occurs at the superior tibiofibular joint?

Answer 5

Slight movement during dorsiflexion of ankle

Question 6

What is this muscle?

Answer 6

Peroneus longus

Question 7

What is the origin of the peroneus longus?

Answer 7

Head and upper 2/3 of lateral fibula

Question 8

What is the insertion of the peroneus longus?

Answer 8

Base of 1st metatarsal and medial cuneiform

Question 9

What innervates the peroneus longus?

Answer 9

Superficial peroneal nerve (L5,S1,2)

Question 10

What is this muscle?

Answer 10

Peroneus brevis

Question 11

What is the origin of the peroneus brevis?

Answer 11

Inferior 2/3 of lateral fibula

Question 12

What is the insertion of the peroneus brevis?

Answer 12

Tuberosity on lateral side of base of 5th metatarsal

Question 13

What innervates the peroneus brevis?

Answer 13

Superficial peroneal nerve (L5,S1,2)

Question 14

What is this muscle?

Answer 14

Tibialis anterior

Question 15

What is the origin of the tibialis anterior?

Answer 15

• Lateral condyle of tibia
• Superior 1/2 of lateral tibial surface
• Interosseous membrane

Question 16

What is the insertion of the tibialis anterior?

Answer 16

• Medial and inferior surfaces of medial cuneiform
• Base of 1st metatarsal

Question 17

What is the innervation of the tibialis anterior?

Answer 17

Deep peroneal nerve (L4,5)

Question 18

What is the function of the tibialis anterior?

Answer 18

• Dorsiflexes ankle
• Inverts foot

Question 19

What is this muscle?

Answer 19

Extensor digitorum longus

Question 20

What is the origin of the extensor digitorum longus?

Answer 20

• Lateral condyle of tibia
• Superior 3/4 of medial surface fibula
• Interosseous membrane

Question 21

What is the insertion of the extensor digitorum longus?

Answer 21

Middle and distal phalanges of lateral 4 digits

Question 22

What innervates the extensor digitorum longus?

Answer 22

Deep peroneal nerve (L4,5)

Question 23

What is the function of the extensor digitorum longus?

Answer 23

• Extends lateral 4 digits
• Dorsiflexion of ankle

Question 24

What is this muscle?

Answer 24

Peroneus tertius

Question 25

What is the origin of the peroneus tertius?

Answer 25

- Inferior 1/3 anterior fibula - Interosseous membrane

Question 26

What is the insertion of the peroneus tertius?

Answer 26

Dorsum of base of 5th metatarsal

Question 27

What innervates peroneus tertius?

Answer 27

Deep peroneal nerve (L4,5)

Question 28

What is the function of the peroneus tertius?

Answer 28

- Dorsiflexes ankle - Assists in eversion of foot

Question 29

What is this muscle?

Answer 29

Extensor hallucis longus

Question 30

What is the origin of the extensor hallucis longus?

Answer 30

- Middle anterior surface fibula - Interosseous membrane

Question 31

What is the insertion of the extensor hallucis longus?

Answer 31

Dorsal aspect of distal phalanx of hallux

Question 32

What innervates the extensor hallucis longus?

Answer 32

Deep peroneal nerve (L4,5)

Question 33

What is the function of the extensor hallucis longus?

Answer 33

- Extends hallux - Dorsiflexes ankle

Question 34

Where does the superior extensor retinaculum attach?

Answer 34

Anterior border of tibia --> lower end of fibula

Question 35

What are these muscles?

Answer 35

Black - extensor hallucis brevis Blue - extensor digitorum brevis

Question 36

What is the common origin of the extensor digitorum brevis and extensor hallucis brevis?

Answer 36

- Superior surface of calcaneus - Inferior extensor retinaculum

Question 37

What is the insertion of the extensor hallucis? brevis

Answer 37

Base of proximal phalanx of hallux

Question 38

What is the insertion of the extensor digitorum brevis?

Answer 38

Long extensor tendons of toes 2-4

Question 39

What innervates the muscles of the dorsum of the foot?

Answer 39

Deep peroneal nerve L5/S1