Muscles Of The Leg

Question 1

Tibialis Anterior

Answer 1

Compartment - anterior compartment of the leg
Origin - lateral surface of tibia and adjacent interosseous membrane
Insertion - medial surface of cuneiform and base of metatarsal I
Action - dorsiflexion and inversion of the foot
Innervation - deep fibular nerve

Question 2

Extensor Digitorum Longus

Answer 2

Compartment - anterior compartment of the leg
Origin - lateral condyle of tibia and medial surface of fibula
Insertion - dorsal surface of middle and distal phalanges II-V
Actions - extension of the lateral four toes and dorsiflexion of foot
Innervation - deep fibular nerve

Question 3

Popliteus

Answer 3

Compartment - posterior deep compartment of the leg
Origin - posterior surface of the proximal tibia
Insertion - lateral condyle of the femur
Actions - medial rotation of the tibia + flexion of the knee
Innervation - tibial nerve

Question 4

Plantaris

Answer 4

Compartment - posterior superficial compartment of the leg
Origin - lateral supracondylar line of the femur
Insertion - blends with the calcaneal tendon
Action - plantarflexes at the ankle joint + flexes the knee
Innervation - tibial nerve

Question 5

Gastrocnemius

Answer 5

Compartment - posterior superficial of the leg
Origin - 2 heads, from the lateral and medial femoral condyles
Insertion - calcaneal tendon, inserting onto the calcaneus
Action - plantarflexion at the ankle, flexion at the knee
Innervation - tibial nerve

Question 6

Soleus

Answer 6

Compartment - posterior superficial compartment of the leg
Origin - soleal line of tibia + proximal fibular area
Insertion - joins the calcaneal tendon and inserts into calcaneus
Action - plantarflexes at the ankle joint
Innervation - tibial nerve

Question 7

Tibialis Posterior

Answer 7

Compartment - Posterior deep compartment of leg
Origin - posterior surface of tibia + fibula, and interosseous membrane in between
Insertion - plantar surface of navicular, cuneiform and metatarsals II-IV
Action - inversion of the foot
Innervation - tibial nerve

Question 8

Fibularis Brevis (Peroneus Brevis)

Answer 8

Compartment - Lateral compartment of the leg
Origin - inferolateral surface of fibula shaft
Insertion - tubercle on metatarsal V
Action - eversion of the foot
Innervation - superficial fibular (peroneal) nerve

Question 9

Fibularis Longus (Peroneus Longus)

Answer 9

Compartment - Lateral compartment of the leg
Origin - superior/lateral surface of fibula + lateral tibial condyle
Insertion - medial cuneiform and base of metatarsal I
Action - eversion and plantarflexion of the foot
Innervation - superficial fibular (peroneal) nerve

Question 10

Fibularis Tertius (Peroneus Tertius)

Answer 10

Compartment - Anterior compartment of the leg
Origin - medial surface of fibula
Insertion - metatarsal V
Action - eversion and dorsiflexion of the foot
Innervation - deep fibular nerve

Question 11

Extensor Hallucis Longus

Answer 11

Compartment - anterior compartment of leg
Origin - medial surface of fibular shaft
Insertion - base of distal phalanx of the great toe
Action - extension of great toe and dorsiflexion of the foot
Innervation - deep fibular nerve

Question 12

Flexor Hallucis Longus

Answer 12

Compartment - posterior deep compartment of the leg
Origin - lower 2/3rd of the posterior aspect of the fibula
Insertion - plantar surface of distal phalanx of great toe
Action - flexes the great toe
Innervation - tibial nerve

Question 13

Flexor Digitorum Longus

Answer 13

Compartment - Posterior deep compartment of leg
Origin - posterior medial surface of the tibia
Insertion - plantar surfaces of distal phalanges of digits II-V
Action - flexes the lateral four toes
Innervation - tibial nerve