33. Anterior and Lateral Leg, Dorsum of Foot

Question 1

What is the name given to the fascia of the leg?

Answer 1

Crural fascia

Question 2

What direction do the fibres of the interosseous membrane run in?

Answer 2

Inferolaterally from tibia to fibula

Question 3

Functions of interosseous membrane?

Answer 3

Surface for muscle attachment

Help resist downward pull of the muscles attached to fibula

Question 4

Classification of the superior tibiofibular joint?

Answer 4

Plane synovial

Question 5

Articulations of superior tibiofibular joint?

Answer 5

Head of fibula

Facet on lateral tibial condyle

Question 6

Movements possible at superior tibiofibular joint?

Answer 6

Slight sliding (plane joint) during dorsiflexion of ankle

Question 7

How many muscles are in the anterior compartment of the leg?

Answer 7

4

Question 8

How many muscles are in the lateral compartment of the leg?

Answer 8

2

Question 9

Action of anterior compartment of leg?

Answer 9

Extend ankle joint (i.e. dorsiflexion) and digits

Question 10

Action of lateral compartment of leg?

Answer 10

Evert foot

Question 11

Where do the tendons of the muscles of the lateral compartment of the leg insert?

Answer 11

Posterior to lateral malleolus

Question 12

What muscles are in the the lateral compartment of the leg?

Answer 12

Peroneus longus

Peroneus brevis

Question 13

Origin of peroneus longus?

Answer 13

Head and upper 2/3 of lateral fibula

Question 14

Insertion of peroneus longus?

Answer 14

Base of 1st metatarsal and medial cunieform

Question 15

Innervation of of peroneus longus?

Answer 15

Superficial peroneal nerve L5, S1, S2

Question 16

Origin of peroneus brevis?

Answer 16

Inferior 2/3 of lateral fibula

Question 17

Insertion of peroneus brevis?

Answer 17

Tuberosity of lateral side of base of 5th metatarsal

Question 18

Innervation of peroneus brevis?

Answer 18

Superficial peroneal nerve L5, S1, S2

Question 19

Which muscles make up the anterior compartment of the leg?

Answer 19

Tibialis anterior
Extensor digitorum longus
Peroneus tertius
Extensor hallucis longus

Question 20

Common innervation of anterior compartment of leg?

Answer 20

Deep peroneal nerve L4, L5

Question 21

Origin of tibialis anterior?

Answer 21

Lateral condyle of tibia,
superior 1/2 of lateral tibial surface,
interosseous membrane

Question 22

Insertion of tibialis anterior?

Answer 22

Medial and inferior surfaces of medial cuneiform and base of 1st metatarsal

Question 23

Action of tibialis anterior?

Answer 23

Dorsiflexes ankle

Inverts foot

Question 24

Origin of EDL?

Answer 24

Lateral condyle of tibia
Superior 3/4 of medial surface of fibula
Interosseous membrane

Question 25

Instertion of EDL?

Answer 25

Middle and distal phalanges of lateral 4 digits

Question 26

Action of EDL?

Answer 26

Extends lateral 4 digits | Dorsiflexes ankle

Question 27

Origin of peroneus tertius?

Answer 27

Inferior 1/3 anterior fibula and interosseous membrane

Question 28

Insertion of peroneus tertius?

Answer 28

Dorsum of base of 5th metatarsal

Question 29

Action of peroneus tertius?

Answer 29

Dorsiflexes ankle | Assists in eversion of foot

Question 30

Origin of EHL?

Answer 30

Middle anterior surface of fibula | Interosseous membrane

Question 31

Insertion of EHL?

Answer 31

Dorsal aspect of distal phalanx of hallux

Question 32

Action of EHL?

Answer 32

Extends hallux | Dorsiflexes ankle

Question 33

Where does the superior extensor retinaculum run?

Answer 33

Anterior border of tibia | To lower end of fibula

Question 34

Where does the inferior extensor retinaculum run?

Answer 34

Stem - lateral part of calcaneus Upper part - medial malleolus Lower part - medial part of foot to blend with fascia of abductor hallucis

Question 35

What muscles are found in the dorsum of the foot?

Answer 35

Extensor hallucis brevis | Extensor digitorum brevis

Question 36

Where do the muscles in the dorsum of the foot originate?

Answer 36

Superior surface of calcaneus and inferior extensor retinaculum

Question 37

Where do the muscles in the dorsum of the foot insert?

Answer 37

EHB - base of proximal phalanx of hallux | EDB - long extensor tendons of toes 2 - 4

Question 38

Innervation of muscles of dorsum of foot?

Answer 38

Deep peroneal nerve L5, S1

Question 39

Where is the superficial peroneal nerve found?

Answer 39

Between peroneus longus and neck of fibula

Question 40

What does the superficial peroneal nerve supply?

Answer 40

Muscles of lateral compartment of leg | Continues as cutaneous nerve to distal anterior surface of leg and most of dorsum of foot

Question 41

Where is the deep peroneal nerve found?

Answer 41

Between peroneus longus and neck of fibula | Passes through extensor digitorum longus

Question 42

What artery does the deep peroneal nerve travel with?

Answer 42

Anterior tibial artery

Question 43

What does the deep peroneal nerve supply?

Answer 43

Anterior compartment muscles Extensor digitorum brevis and extensor hallucis brevis Cutaneous to skin between digits 1 and 2

Question 44

What cutaneous nerve supplies innervation to the majority of the anterior leg?

Answer 44

Saphenous (from femoral)

Question 45

What does the popliteal artery branch into at the level of popliteus?

Answer 45

Anterior and posterior tibial arteries

Question 46

What does the posterior tibial artery branch into?

Answer 46

Fibular artery

Question 47

What does the anterior tibial artery become once past the ankle?

Answer 47

Dorsalis pedis

Question 48

What are the branches of the dorsalis pedis artery?

Answer 48

Lateral tarsal Arcuate Deep plantar

Question 49

What two branches of the dorsalis pedis artery anastomose?

Answer 49

Lateral tarsal and arcuate