17: Anterior And Lateral Leg

Question 1

Two functions of the anterior leg

Answer 1

Dorsiflexion, toe extension

Question 2

Four muscles of anterior leg

Answer 2

1. Tibialis anterior
2. Extensor hallucis longus
3. Extensor digitorum longus
4. Fibularis tertius

Question 3

Tibialis anterior O and I

Answer 3

O: lateral tibial condyle
I: medial surface of 1st cuneiform, first metatarsal

Question 4

Tibialis anterior A

Answer 4

Dorsiflexion, foot inversion

Question 5

Extensor hallucis longus O and I

Answer 5

O: anteromedial fibula, interosseous membrane
I: distal phalanx of hallux

Question 6

Extensor hallucis longus A

Answer 6

Extend hallux, dorsiflexion

Question 7

Extensor digitorum longus O and I

Answer 7

O: lateral tibial condyle, anterior fibular surface, interosseous membrane
I: forms an extensor expansion over dorsum of lateral four proximal phalanges

Question 8

Slips of extensor expansion of extensor digitorum longus

Answer 8

Two lateral slips over the distal phalanx + one central slip over the middle phalanx

Question 9

Extensor digitorum longus A

Answer 9

Extend lateral four digits, dorsiflexion

Question 10

Fibular tertius presence

Answer 10

Variable; fused with digitorum longus proximally

Question 11

Difference between fibularis tertius and the fibularis muscles

Answer 11

Fibularis tertius: tendon runs anterior to lateral malleolus

Fibularis muscles: tendon runs posterior to lateral malleolus

Question 12

Fibular tertius O and I

Answer 12

O: anteroinferior fibula
I: dorsum of fifth metatarsal

Question 13

Fibularis tertius A

Answer 13

Dorsiflexion, eversion

Question 14

Shin splints

Answer 14

Mild form of compartment syndrome due to repetitive microtrauma to tibialis anterior -> small tears in periosteum of tibia/deep fascia

Question 15

Innervation to anterior leg

Answer 15

Deep fibular N

Question 16

Blood supply to anterior leg

Answer 16

Anterior tibial A

Question 17

What does the deep fibular N run with?

Answer 17

Anterior tibial A and V

Question 18

Terminal branches of the deep fibular N

Answer 18

Medial and lateral terminal branches on dorsum of foot

Question 19

What does the deep fibular N supply?

Answer 19

Anterior compartment, ankle joint, metacarpal-phalange joints, dorsal intrinsic foot muscles, skin between 1st and 2nd digits

Question 20

Where does anterior tibial A come from?

Answer 20

Popliteal A

Question 21

Where does the anterior tibial A begin?

Answer 21

Inferior border of popliteus, near tibial tuberosity

Question 22

Anterior tibial A path

Answer 22

Runs anterior on the interosseous membrane, between EHL and TA muscles

Question 23

Termination of anterior tibial A

Answer 23

Dorsalis pedis A (at ankle)

Question 24

Two muscles in lateral leg

Answer 24

Fibularis longus, fibularis brevis

Question 25

Which lateral leg muscle is more superficial?

Answer 25

Fibularis longus

Question 26

Fibularis longus O and I

Answer 26

O: head/superolateral fibula
I: first metatarsal, medial cuneiform

Question 27

Fibularis longus path

Answer 27

Runs just posterior to lateral malleolus, obliquely across sole of the foot

Question 28

Fibularis longus and brevis action

Answer 28

Eversion, plantarflexion

Question 29

Fibularis brevis O and I

Answer 29

O: inferolateral 2/3 of tibia
I: dorsal/lateral side of fifth metatarsal

Question 30

Innervation to lateral compartment of leg

Answer 30

Superficial fibular N

Question 31

Where does the superficial fibular N become superficial

Answer 31

In the distal third of the leg

Question 32

Superficial fibular N supplies?

Answer 32

Anteroinferior leg, nearly entire dorsal surface of foot/toes

Question 33

Blood supply to lateral leg (no distinct artery accompanying this compartment)

Answer 33

Fibular A branches

Question 34

What is the largest branch of the posterior tibial A

Answer 34

Fibular A