LowerLegFxn&Innervation

Question 1

Fxn and Innervation: Tibialis Anterior

Answer 1

Fxn: Dorsiflexes foot at ankle, inverts foot
Innervation: Deep Fibular Nerve

Question 2

Fxn and Innervation: Extensor digitorum longus

Answer 2

Fxn: Extends digits 2-5, dorsiflexes foot at ankle
Innervation: Deep fibular nerve

Question 3

Fxn and Innervation: Extensor hallucis longus

Answer 3

Fxn: Extends digit 1, dorsiflexes foot at ankle
Innervation: Deep Fibular Nerve

Question 4

What are the three muscles of the anterior compartment of the lower leg? What is their shared innervation?

Answer 4

Tibialis Anterior
Extensor Digitorum Longus
Extensor Hallucis Longus

ALL innervated by the Deep Fibular Nerve

Question 5

Fxn and Innervation: Fibularis Longus

Answer 5

Fxn: Everts foot at the ankle, weak plantarflexion
Innervation: Superficial fibular nerve

Question 6

Fxn and Innervation: Fibularis Brevis

Answer 6

Fxn: Everts foot at the ankle, weak plantarflexion
Innervation: Superficial fibular nerve

Question 7

What are the two muscles of the lateral compartment of the lower leg? What nerve innervations and functions do they both have?

Answer 7

Fibularis Longus
Fibularis Brevis

Both are innervated by the superficial fibular nerve. Both Everts foot at the ankle, weak plantarflexion.

Question 8

Fxn and Innervation: Gastrocnemius

Answer 8

Fxn: Plantarflexes foot at ankle, flexes leg at knee
Innervation: Tibial nerve

Question 9

Fxn and Innervation: Plantaris

Answer 9

Fxn: Weak plantarflexion
Innervation: Tibial Nerve

Question 10

Fxn and Innervation: Popliteus

Answer 10

Fxn: Weakly flexes knee, control of bent knee, rotates tibia
Innervation: Tibial Nerve

Question 11

Fxn and Innervation: Soleus

Answer 11

Fxn: Flexes foot at the ankle
Innervation: Tibial nerve

Question 12

Fxn and Innervation: Tibialis Posterior

Answer 12

Fxn: Plantarflexes foot at ankle, inverts foot at ankle
Innervation: Tibial Nerve

Question 13

Fxn and Innervation: Flexor digitorum longus

Answer 13

Fxn: Flexion of digits 2-5, plantarflexion of foot at ankle
Innervation: Tibial Nerve

Question 14

Fxn and Innervation: Flexor hallucis longus

Answer 14

Fxn: Flexes hallux (big toe)
Innervation: Tibial Nerve

Question 15

What nerve innervates ALL of the posterior compartment of the lower leg?

Answer 15

Tibial Nerve

Question 16

What muscles are in the posterior compartment of the lower leg? What innervates them?

Answer 16

Gastrocnemius
Soleus
Plantaris
Popliteus
Tibialis Posterior
Flexor Digitorum Longus
Flexor Hallucis Longus

Question 17

What are the muscles of the planter foot?

Answer 17

Flexor Digitorum Brevis
Abductor Hallucis
Abductor Digiti Minimi
Quadratus Plantae
Flexor Hallucis Brevis

Question 18

Fxn and Innervation: Flexor digitorum brevis

Answer 18

Fxn: Flex digits 2-5
Innervation: Medial plantar nerve

Question 19

Fxn and Innervation: Abductor hallucis

Answer 19

Fxn: Abduct hallux (big toe)
Innervation: Medial plantar nerve

Question 20

Fxn and Innervation: Abductor digiti minimi

Answer 20

Fxn: Abduct little toe
Innervation: Lateral plantar nerve

Question 21

Fxn and Innervation: Quadratus plantae

Answer 21

Fxn: flexing digits 2-5
Innervation: Lateral plantar nerve

Question 22

Because Quadratus Plantae does not insert onto the toes, how does it perform the function of flexing digits 2-5?

Answer 22

It inserts on the tendon of flexor digitorum longus

Question 23

Fxn and Innervation: Flexor hallucis brevis

Answer 23

Fxn: Flex hallux (big toe)
Innervation: Medial plantar nerve

Question 24

Fxn and Innervation: Adductor hallucis

Answer 24

Fxn: Adduct hallux (big toe), arch support
Innervation: Lateral plantar nerve