Muscles of the Leg Anterior Compartment (Dorsiflexors)

Question 1

FT TA AND 2 Extensor 4in total

List all the muscles contained within the Anterior compartment of the leg which are involved in Dorsiflexion

Answer 1

Tibialis Anterior

Extensor Digitorum Longus

Fibularis Tertius

Extensor Hallucis Longus

Question 2

Detail the Characteristics of Tibialis Anterior

Answer 2

Tibialis Anterior
* Origin - Lateral surface of the Tibial condoyle and Interosseous Membrane
* Insertion - Medial Cuneiform and base of Metatarsal 1
* Innervation - Deep Fibular Nerve
* Function - Dorsiflexion of the foot at the Talocrural joint and Inversion of the foot at the Subtalar Joint

Question 2

Detail the Characteristics of Extensor Hallucis Longus muscle

Answer 2

Extensor Hallucis Longus
* Origin - Middle third of the medial surface of the Fibula and adjacent Interosseous Membrane
* Insertion - Base of Distal Phalanx of the Hallux
* Innervation - Deep Fibular Nerve
* Function - Extension of the Hallux and Dorsiflexion of the foot

Question 3

Detail the Characteristics of Extensor Digitorum Longus

Answer 3

Extensor Digitorum Longus
* * Origin - Medial surface of the Fibula and the related surface of the Lateral Tibial Condoyle
* Insertion - Via Dorsal digital expansions into the Distal and Middle Phalanges of toes 2-5
* * Innervation - Deep Fibular Nerve
* * Function - Toe Extension at MTP and IP Joints of toes 2-5 and Dorsiflexion of the foot

Question 4

Detail the Charecteristics of the Fibularis Tertius Muscle

Answer 4

Fibularis Tertius
* Origin - Medial surface (Distal third) of Fibula and Interosseous Membrane
* Insertion - Dorsal surface of base of the 5th Metatarsal bone
* Innervation - Deep Fibular nerve
* Function - Dorsiflexion and Eversion of the foot