Muscle Chart: Anterior Leg Compartment And Dorsum Of Foot

Question 1

Tibialis Anterior

Origin, Insertion, Innervation, Blood Supply

Answer 1

Origin: lateral condyle of the tibia and lateral surface of the tibia and interosseous membrane

Insertion: Medial cuneiform and base of 1st metatarsal

Innervation: Deep peroneal nerve (L4, L5)

Blood Supply: Anterior tibial artery

Question 2

Tibailis Anterior Movements

Answer 2

Inverts the foot

Dorsiflexes the ankle (talocrural joint)

Question 3

Extensor Hallucis Longus

Origin, Insertion, Innervation, Blood Supply

Answer 3

Origin: Middle anterior surface of fibula and interosseous membrane

Insertion: Distal phalanx of the 1st digit

Innervation: Deep peroneal (L4, L5)

Blood Supply: Anterior tibial

Question 4

Extensor Hallucis Longus Movements

Answer 4

Extends digit 1

Dorsiflexes the ankle (talocrural joint)

Inverts the foot

Question 5

Extensor Digitorum Longus

Origin, Insertion, Innervation, Blood Supply

Answer 5

Origin: Lateral condyle of the tibia, proximal anterior shaft of the fibula and interosseous membrane

Insertion: Middle and distal phalanges of digits 2-5

Innervation: Deep peroneal (L4, L5, S1)

Blood Supply: Anterior tibial

Question 6

Extensor Digitorum Longus Movements

Answer 6

Extends digits 2-5

Dorsiflexes the ankle

Evert the foot

Question 7

Peroneus/Fibular Tertius

Origin, Insertion, Innervation, Blood Supply

Answer 7

Origin: Distal 1/3 of the anterior fibula

Insertion: Dorsal surface of the base of the 5th metatarsal

Innervation: Deep peroneal (L4, L5, S1)

Blood Supply: Fibular artery

Question 8

Peroneus/Fibularis Tertius Movements

Answer 8

Works with the extensor digitorum longus to dorsiflex the ankle

Weakly everts the foot and assists in extending digit 5

Question 9

Extensor Hallucis Brevis

Origin, Insertion, Innervation, Blood Supply

Answer 9

Origin: Dorsal surface of the calcaneus (sinus tarsi)

Insertion: Proximal phalanx of 1st toe

Innervation: Deep peroneal (L4, L5, S1)

Blood Supply: Dorsalis pedis artery

Question 10

Extensor Hallucis Brevis Movements

Answer 10

Extends the great toe at MTP joint

Question 11

Extensor Digitorum Brevis

Origin, Insertion, Innervation, Blood Supply

Answer 11

Origin: Dorsal surface of calcaneus

Insertion: 2nd and 4th toes via the extensor digitorum longus tendons

Innervation: Deep peroneal (L4, L5, S1)

Blood Supply: Dorsalis pedis artery

Question 12

Extensor Digitorum Brevis Movements

Answer 12

Extend 2-4 toes at MTP, PIP and DIP joints