Anterior and Lateral Compartment Leg Muscles (Exam/Quiz 3)

Question 1

What are the 4 muscles in the anterior compartment of the leg?

Answer 1

1) tibialis anterior
2) extensor digitorum longus
3) extensor hallucis longus
4) fibularis tertius

Question 2

There are 4 muscles in the anterior compartment of the leg: tibialis anterior, extensor digitorum longus, extensor hallucis longus, and fibularis tertius. These muscles pass and insert anterior to the transversely oriented axis of the ankle (talocrural) joint and, therefore, are ___________ of the ankle joint, elevating the forefoot and depressing the heel

Answer 2

dorsiflexors (toes go up)

Question 3

There are 4 muscles in the anterior compartment of the leg: tibialis anterior, extensor digitorum longus, extensor hallucis longus, and fibularis tertius. These muscles pass and insert anterior to the transversely oriented axis of the ankle (talocrural) joint and, therefore, are dorsiflexors of the ankle joint, elevating the forefoot and depressing the heel. The long extensors also pass along and attach to the dorsal aspect of the digits and are thus ____________ of the toes

Answer 3

extensors (elevators)

Question 4

All of the anterior compartment muscles of the leg are innervated by the….

test q

Answer 4

deep fibular n.

Question 5

All of the lateral compartment muscles of the leg are innervated by the….

test q

Answer 5

superficial fibular n.

Question 6

What are the 2 muscles of the lateral compartment of the leg?

Answer 6

1) fibularis longus
2) fibularis brevis

Question 7

What is the origin/proximal attachment for the tibialis anterior?

Answer 7

lateral condyle and superior half of lateral surface of tibia and interosseous membrane

Question 8

What is the insertion/distal attachment of the tibialis anterior?

Answer 8

medial and inferior surfaces of the medial cuneiform and base of the 1st metatarsal

Question 9

What innervates the tibialis anterior?

Answer 9

deep fibular n.

Question 10

What are the actions of the tibialis anterior?

Answer 10

-dorsiflexes ankle and inverts foot
-active in controlling forefoot to the ground during heel strike

Question 11

What is the origin/proximal attachment for the extensor digitorum longus?

Answer 11

lateral condyle of tibia and superior 3/4 of medial surface of fibula and interosseous membrane

Question 12

What is the insertion/distal attachment for the extensor digitorum longus?

Answer 12

middle and distal phalanges of lateral 4 digits

Question 13

What innervates the extensor digitorum longus?

Answer 13

deep fibular n.

Question 14

What are the actions of the extensor digitorum longus?

Answer 14

extends lateral 4 digits and dorsiflexes the ankle

Question 15

What is the origin/proximal attachment for the extensor hallucis longus?

Answer 15

middle part of anterior surface of the fibula and interosseous membrane

Question 16

What is the insertion/distal attachment for the extensor hallucis longus?

Answer 16

dorsal aspect of base of distal phalanx of great toe/hallux

Question 17

What innervates the extensor hallucis longus?

Answer 17

deep fibular n.

Question 18

What are the actions of the extensor hallucis longus?

Answer 18

extends great toe and dorsiflexes the ankle

Question 19

What is the origin/proximal attachment for the fibularis tertius?

Answer 19

inferior 3rd of anterior surface of fibula and interosseous membrane

Question 20

What is the insertion/distal attachment for the fibularis tertius?

Answer 20

dorsum of base of 5th metatarsal

Question 21

What innervates the fibularis tertius?

Answer 21

deep fibular n.

Question 22

What are the actions of the fibularis tertius?

test q

Answer 22

-dorsiflexes ankle and aids in eversion of the foot
-contracts reflexively where it senses sudden inversion to protect the tibiofibular ligament (the most commonly sprained ligament in the body)

Question 23

What is the most commonly sprained ligament in the body?

Answer 23

tibiofibular ligament

Question 24

What is the origin/proximal attachment for the fibularis longus?

test q

Answer 24

head and superior 2/3 of lateral surface of fibula

Question 25

What is the insertion/distal attachment of the fibularis longus?

test q

Answer 25

base of 1st metatarsal and medial cuneiform

Question 26

What innervates the fibularis longus?

test q

Answer 26

superficial fibular n.

Question 27

What are the actions of the fibularis longus AND brevis?

test q

Answer 27

everts foot and weakly plantar flexes ankle

Question 28

What is the origin/proximal attachment for the fibularis brevis?

test q

Answer 28

inferior 2/3 of lateral surface of the fibula

Question 29

What is the insertion/distal attachment for the fibularis brevis?

test q

Answer 29

dorsal surface of tuberosity on lateral side of base of 5th metatarsal

Question 30

What innervates the fibularis brevis?

test q

Answer 30

superficial fibular n.