leg

Anterior compartment

cutaneous nerves

Saphenous nerve

· gives off infrapatellar branch

· to upper tibia and overlying skin

· divides into two

· travels either side of great saphenous vein

· ends on medial foot over bunion

Lateral cutaneous nerve of calf

· branch of common peroneal nerve

· supplies upper part of anterior and lateral leg

Superficial peroneal nerve

· supplies skin over distal part of anterior and lateral leg

veins

Great saphenous vein

· drains medial side of dorsal venous arch

· starts anterior to medial malleolus

· travels up anteromedial calf

· receives perforating veins

· blood flows from superficial to deep

deep fascia

· attached to anterior and posterior borders of tibia

· attached to fibula at ankle

· two intermuscular septae

· anterior and posterior

· attach to fibula

· enclose peroneal compartment

· extensor compartment enclosed by

· deep fascia and interosseous membrane

· medially by exensor surface of tibia

· laterally by extensor surface of tibia and anterior intermuscular septum

muscles

Tibialis anterior

Origin

· upper 2/3 of extensor surface of tibia

· IOM

· overlying deep fascia

Path

· tendon pierces superior extensor retinaculum

Insertion

· medial cuneiform (and adjacent MC I)

Extensor hallucis longus

Origin

· middle 1/2 of extensor surface of fibula

· adjacent IOM

Path

· emerges from between TA and EDL in lower leg

· tendon passes beneath superior extensor retinaculum

Insertion

· base of P1 of great toe

Extensor digitorum longus

Origin

· upper 3/4 of extensor surface of fibula

· superior tibiofibular joint

· anterior intermuscular septum

Path

· forms 4 tendons beneath superior extensor retinaculum

Insertion

· extensor mechanism of lateral 4 toes

Peroneus tertius

· really lower part of EDL

Origin

· lower 1/4 of extensor surface of fibula

Insertion

· dorsum and shaft of MT V

Neurovascular

Deep peroneal nerve

· arises in substance of peroneus longus

· over neck of fibula

· at bifurcation of common peroneal nerve

· spirals around neck of fibula

· deep to EDL

· reaches IOM

· in proximal leg

· lies on lateral side of anterior tibial a

· lies between muscles of upper part of compartment

· TA and EDL

· in middle leg

· lies in front of anterior tibial a

· lies between tibial and fibular muscles

· TA and EHL

· then EHL crosses bundle from lateral to medial

· in distal leg

· lies on lateral side of anterior tibial a

· lies between TA and EHL medially

· and EDC and PT laterally

· “Tom Had A Night Down Town”

· supplies muscles of extensor compartment

· TA

· EHL

· EDC

· PT

Anterior tibial artery

· formed by bifurcation of popliteal a in calf

· passes forwards above IOM

· runs vertically down IOM

· crosses ankle joint midway between malleoli

· changes name to dorsalis pedis artery

· TA lies medial to it

· EDC and PT lie lateral to it

· EHL starts lateral and then crosses to medial

· deep peroneal nerve lies lateral, anterior and lateral to it