The leg anatomy

Question 1

What is the function of the muscles in the anterior compartment of the leg?

Answer 1

Foot dorsiflexion
Foot inversion

Question 2

What is the collective innervation of muscles in the anterior compartment the leg?

Answer 2

Deep fibular nerve (L4-S1)

Question 3

Name the 4 muscles in the anterior compartment of the leg.

Answer 3

Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Fibularis tertius

Question 4

What is the function of the tibialis anterior?

Answer 4

Foot dorsiflexion
Foot inversion

Question 5

What is the innervation of tibialis anterior?

Answer 5

Deep fibular nerve

Question 6

What is the function of the extensor digitorum longus?

Answer 6

Foot dorsiflexion
Lateral 4 toes extension

Question 7

What is the innervation of extensor digitorum longus?

Answer 7

Deep fibular nerve.

Question 8

What is the function of extensor hallucis longus?

Answer 8

Foot dorsiflexion
Great toe extension

Question 9

What is the innervation of extensor hallucis longus?

Answer 9

Deep fibular nerve

Question 10

What is the function of fibularis tertius (peroneus tertius)?

Answer 10

Foot dorsiflexion
Foot eversion

Question 11

What is the innervation of fibularis tertius (peroneus tertius)?

Answer 11

Deep fibular nerve

Question 12

Foot drop often occurs as a result of damage to which nerve?

Answer 12

Common fibular nerve (from which deep fibular nerve arises)

Question 13

Name the 2 muscles present in the lateral compartment of the leg

Answer 13

Fibularis longus
Fibularis brevis

**AKA peroneus longus and peroneus brevis.

Question 14

What is the function of muscles in the lateral compartment of the leg?

Answer 14

Foot eversion

Question 15

What is the innervation of muscles in the lateral compartment of the leg?

Answer 15

Superficial fibular nerve

Question 16

Where does fibularis attach to?

Answer 16

Medial cuneiform and base of metatarsal 1

Question 17

What is the function of fibularis longus?

Answer 17

Foot eversion
Foot plantarflexion.

**Also supports lateral and transverse arches of the foot.

Question 18

What is the innervation of fibularis longus?

Answer 18

Superficial fibular (peroneal) nerve

Question 19

What is the function of fibularis brevis?

Answer 19

Foot eversion

Question 20

What is the innervation of fibularis brevis?

Answer 20

Superficial fibular nerve (Peroneal)

Question 21

What is the attachment site of fibularis brevis?

Answer 21

Tubercle of 5th metatarsal.

Question 22

Describe the arrangement of fibularis longus and brevis around the lateral malleolus.

Answer 22

Fibularis longus is more superficial and runs more laterally compared to the fibularis brevis.

Question 23

Which type of injury is most likely to affect fibularis longus and fibularis brevis?

Answer 23

Inversion injuries

Question 24

What is the collective action of muscles in the posterior compartment of the leg?

Answer 24

Plantarflexion + inversion of the foot

Question 25

What is the innervation of muscles in the posterior compartment of the leg?

Answer 25

Tibial nerve

Question 26

What is the main blood supply to the posterior compartment of the leg?

Answer 26

Posterior tibial artery

Question 27

What are the 3 muscles in the superficial compartment of the posterior leg?

Answer 27

Gastrocnemius Soleus Plantaris

Question 28

What are the 4 muscles in the deep compartment of the posterior leg?

Answer 28

Popliteus Flexor digitorum longus Flexor hallucis longus Tibialis posterior

Question 29

What is the function of the gastrocnemius?

Answer 29

Foot plantarflexion Knee flexion

Question 30

What is the innervation of the gastrocnemius?

Answer 30

Tibial nerve

Question 31

What is the function of the soleus?

Answer 31

Foot plantarflexion

Question 32

What is the innervation of the soleus?

Answer 32

Tibial nerve

Question 33

What is the function of the plantaris?

Answer 33

Contributes to plantarflexion of foot and flexion of knee.

Question 34

What is the innervation of the plantaris?

Answer 34

Tibial nerve.

Question 35

What is the function of the popliteus?

Answer 35

Lateral rotation of femur on tibia ('unlocks' the knee so flexion can occur)

Question 36

What is the innervation of the popliteus?

Answer 36

Tibial nerve

Question 37

What is the function of flexor digitorum longus?

Answer 37

Flexion of lateral 4 toes

Question 38

What is the innervation of flexor digitorum longus?

Answer 38

Tibial nerve

Question 39

What is the function of flexor hallucis longus?

Answer 39

Flexion of great toe

Question 40

What is the innervation of flexor hallucis longus?

Answer 40

Tibial nerve

Question 41

What is the function of tibialis posterior?

Answer 41

Foot plantarflexion and inversion. **Also contributes to medial arch of the foot.

Question 42

What is the innervation of tibialis posterior?

Answer 42

Tibial nerve