Anterior and Lateral Leg Dorsum of Foot

Question 1

What does the interosseous membrane do?

Answer 1

Provides a surface for muscle attachment

Fibres pass inferolaterally from Tibia to Fibula

Helps resist the downward pull of muscles attached to the fibula

Question 2

Anterior compartment

Answer 2

4 muscles
Extensors of ankle jt and digits
Tendons anterior to ankle jt

Ankle extension = Dorsiflexion

Question 3

Lateral compartment

Answer 3

2 Muscles
Evertors of the foot
Tendons posterior to lateral malleolus

Question 4

Lateral compartment- Peorneus Longus

Answer 4

Head and upper 2/3 of lateral fibula
>base of 1st metatrsal and Medial cuneiform

Superficial Peroneal Nerve (L5, S1, S2)

Question 5

Lateral compartment-

Perneus Brevis

Answer 5

Inferior 2/3 of lateral Fibula
> Tuberosity on lateral side of base of 5th metatarsal

superficial peroneal nerve
(L5, S1, S2)

Question 6

Anterior compartment: name 4 muscles and nerve that supplies them?

Answer 6

Tibialis anterior
Extensor digitorium longus
Peroneus tertius
Extensor hallucis longus

All supplied by deep peroneal nerve
-L4,L5

Question 7

Tibialis anterior

Answer 7

Lat. condyle of Tibia, Sup. ½ of Lat. Tibial surface, Interosseous mem.

→ Med. and Inf. surfaces of Medial Cuneiform and base of 1st metatarsal

Dorsiflexes ankle; Inverts foot

Question 8

Extensor digitorium longus

Answer 8

Lat. Condyle Tibia, Sup. ¾ of med surface Fibula, Interosseous membrane
Middle and distal Phalanges of Lateral 4 digits

Extends lateral 4 digits; Dorsiflexes ankle

Question 9

Peroneus Tertius

Answer 9

Inf. ⅓ anterior Fibula and Interosseous membrane
Dorsum of base of 5th Metatarsal

Dorsiflexes ankle; Assists in eversion of foot

Question 10

Extensor Hallucis Longus

Answer 10

Middle ant. surface Fibula, Interosseous membrane
Dorsal aspect of distal Phalanx of Hallux

Extends Hallux; Dorsiflexes ankle

Question 11

Superior Extensor retinaculum

Answer 11

Ant. Border of Tibia  Lower end of Fibula

Question 12

Inferior extensor retinaculum

Answer 12

(y-shaped)
Stem attached to Calcaneus laterally

Upper Limb attached to Medial Malleolus

Lower Limb passes round medial border of foot to blend with dense fascia over abductor hallucis

Question 13

Muscles of Dorsum of foot

Answer 13

Superior surface of calcaneus, Inferior extensor retinaculum

> Extensor Hallucis Brevis

> Extensor Digitorum Brevis

Question 14

Extensor Hallucis Brevis

Answer 14

> Base of proximal phalanx of hallux

Question 15

Extensor digitorum brevis

Answer 15

> Long extensor tendons of toes 2-4

Deep peroneal nerve
L5/S1

Question 16

Superficial peroneal nerve

Answer 16

Branch of common peroneal between peroneus longus and neck of fibula

Lateral compartment of leg supplying muscles and continuing as cutaneous nerve

Cutaneous innervation to distal anterior surface of leg and most of dorsum of foot

Question 17

Deep peroneal nerve

Answer 17

Branch of common peroneal between peroneus longus and neck of fibula
Passes through extensor digitorum longus and travels with anterior tibial a. supplying all anterior compartment mm.
Crosses the ankle jt. to supply ext. digitorum brevis and ext. hallucis brevis
Cutaneous innervation to skin between digits 1 and 2

Question 18

what gives anterior and posterior tibial aa.?

Answer 18

Popliteal artery

Question 19

where does the anterior tibial artery pass through?

Answer 19

Interosseous membrane and descends on this

Question 20

What does posterior tibial artery give?

Answer 20

Fibular artery that provides perforating branches to lateral compartment

Question 21

Dorsalis Pedis artery is a continuation of what?

Answer 21

Anterior Tibial artery

Question 22

Branches of Dorsalis Pedis

Answer 22

Lateral tarsal artery
Deep plantar artery (sole of foot)
Arcuate artery

Question 23

Where does the arcuate artery run across?

Answer 23

Arcuate artery runs across metatarsals to anastomose with Lateral tarsal artery