Anterior And Lateral Compartment Of Leg

Question 1

Anterior intramuscular septum

Answer 1

Connect the deep fascia with the anterior border of the fibula

Question 2

Posterior inter muscular septum

Answer 2

Connects the deep fascia with posterior border of the fibula

Question 3

Deep fascia doesn’t completely encircle the leg, where does it extend?

Answer 3

From anterior surface of tibia, around the leg, to the medial border of the tibia.

Question 4

Muscles of the anterior compartment of leg (4)

Answer 4

Tibialis anterior, Extensor Digitorum Longus, Extensor hallucis longus, Fibularis tertius.

Question 5

Where do anterior leg muscles arise?

Answer 5

From fibula, except from tibialis anterior which arises from tibia.

Question 6

What nerve supplies the anterior compartment of leg?

Answer 6

Deep fibular nerve

Question 7

Action of muscles of anterior compartment of leg?

Answer 7

Dorsi flexion of the foot at ankle joint.

Question 8

Tibialis anterior origin and insertion.

Answer 8

Superior 2/3 of the lateral surface of the tibia (and lateral condyle) and adjacent interosseous membrane to medial cuneiform and base of 1st metatarsal bone.

Question 9

Tibialis anterior action and innervation

Answer 9

DEEP FIBULAR NERVE, Dorsiflexion of foot at ankle joint and inversion of foot at subtalar and midtarsal joints.

Question 10

Extensor digitorum longus origin and insertion.

Answer 10

Superior 3/4ths of anterior surface of fibula -lt condyleand adjacent interosseus membrane to (via 4 tendons) extensor expansion covering back of proximal phalanx and is attached to the bases of lateral 4 middle and distal phalanges.

Question 11

Extensor digitorum longus action and innervation

Answer 11

Extension of lateral toes, dorsiflexion

Question 12

Extensor hallucis longus origin and insertion

Answer 12

Middle 2/4ths of anterior surface of the fibula and adjacent interosseus membrane to dorsal surface of the base of distal phalanx of the big toe.

Question 13

Extensor hallucis longus

Answer 13

Extension of all joints of big toe and dorsiflexion of foot at ankle joint.

Question 14

Fibularis tertius origin and insertion

Answer 14

Lower 1/4th of anterior surface of fibula to base of fifth metatarsal bone.

Question 15

Fibularis tertius action and innervation

Answer 15

Dorsiflexion of foot at ankle joint, assist in eversion of foot at subtalar and midtarsal joints, deep fibular nerve.

Question 16

Anterior tibial artery origin

Answer 16

Inferior border of popliteus muscle

Question 17

Anterior tibial artery course

Answer 17

Inferior border of popliteus muscle, through interosseus membrane to reach anteriorcompartment.
Descends on the interosseus membrane in the superior one third of the leg, between tibialis anterior muscle (medially ) and extensor digitorum muscle (laterally). In the middle 1/3 of leg lies between tibialis anterior muscle (medially) and extensor hallucis longus muscle (laterally). Inferior one third it is crossed by the extensor hallucis longus at the ankle joint, and it lies between extensor hallucis longus (medially) and extensor digitorum muscle (laterally).

Question 18

Deep fibular nerve

Answer 18

Superior 1/3 lateral to anterior tibial artery
Middle 1/3 anterior to artery
Lower 1/3 lateral to the artery

Question 19

Anterior tibial artery continuation

Answer 19

Dorsal is pedis artery in front of the ankle joint underneath extensor retinaculum

Question 20

Anterior tibial artery branch on posterior aspect of leg

Answer 20

Posterior tibial recurrent artery (supplying the back of the knee joint)

Question 21

Anterior tibial artery branch on anterior leg

Answer 21

Anterior tibial recurrent branch (skin of the knee joint)

Question 22

Anterior tibial artery branches

Answer 22

Posterior tibial recurrent (post knee joint)
Anterior tibial recurrent (skin of knee)
Muscular branches (anterior compartment)
Anterior medial malleollar artery
Anterior lateral malleolar artery

Question 23

Deep fibular nerve course

Answer 23

Branch of common fibular nerve (one of 2 terminal branches)- within Fibularis longus - on lateral aspect of the neck of fibula
Pierces anterior inter muscular septum to reach anterior compartment
Passes through upper part of extensor digitorum longus
Descends on the interosseus membrane (with the anterior tibial artery)
Lateral/anterior/lateral to arterial artery
Runs anterior to ankle joint to reach dorsal surface of the foot

Question 24

Deep fibular nerve branches

Answer 24

To muscles of the anterior compartment :tibialis anterior, extensor hall long, ext digit long and Fibularis tertius

Question 25

Lateral compartment of leg contents

Answer 25

Muscles- Fibularis longus and brevis Superficial fibular nerve Perforating branches from fibular artery

Question 26

Fibularis longus origin and insertion

Answer 26

Superior 2/3 of lateral surface of fibula to medial cuneiform and base of the 1st metatarsal

Question 27

Fibularis longus action and innervation

Answer 27

Superficial fibular nerve, - eversion of foot at subtalar and midtarsal joints - plantarflexion of foot at ankle joint - maintains transverse and lateral longitudinal arches of foot.

Question 28

Fibularis brevis origin and insertion

Answer 28

Inferior 2/3 of lateral surface of fibula to base of 5th metatarsal

Question 29

Fibularis brevis action and innervation

Answer 29

Superficial fibular nerve Eversion of foot at subtalar and midtarsal joints Plantarflexion f foot at ankle joint Support of lateral longitudinal arch of foot

Question 30

Superficial fibular nerve course

Answer 30

Terminal branch of common fibular nerve on lateral side of neck of the fibula. Superior 3rd- descends in the substance of Fibularis longus Middle 3rd- emerges from Fibularis longus to lie between it and Fibularis brevis Lower 3rd of leg pierces deep fascia to descend in the superficial fascia Crossing superficial to the extensor retinaculum to enter the dorsum of the foot Divides into medial and lateral termina branches

Question 31

SuPERFICIAL fibular nerve branches

Answer 31

Muscular branches to fibularis longus and brevis Cutaneous branches to the inferior 1/3 of the lateral surface of the leg Cutaneous branches of all dorsal surface of toes (except lateral side of 5th toe- sural nerve and between 1 and 2nd toe-deep fibular nerve) Medial and lateral terminal branches

Question 32

Fibular artery perforating branches (

Answer 32

Supply lateral compartment of the leg