Download Leg and Ankle

HumanAnatomy100
Leg
PROXIMALTIBIOFIBULARJOINT
• Planejoint
• Synovialjoint
• Only10%ofweightfromfemurgoesthroughfibula
Movement
Glidingwhentheanklemoves
Stability
- Jointcapsule
- Anteriorandposteriortibiofibularligaments INTEROSSESUSMEMBRANE
Betweenthetibiaandfibular
Proximal
tibiofibular
joint
Tibia
Interosseous membrane
Anteriorcrest
ANTERIOR VIEW
POSTERIOR VIEW
Distal
tibiofibular
joint
Fibular
Medial
malleolus
Lateral
malleolus
THREECOMPARMENTSOFTHELEG
1) Anterior 2)Lateral
ANTERIOR COMPARTMENT
Tibialis Anterior
Extensor Hallucis Longus
Extensor Digitorum Longus
LATERAL COMPARTMENT
Fibularis Longus
Fibularis Brevis
3)Posterior
DEEP POSTERIOR
COMPARTMENT
Tibialis Posterior
Flexor Hallucis Longus
Flexor Digitorum Longus
Popliteus
SUPERFICIAL POSTERIOR
COMPARTMENT
Tibialis Anterior
Extensor Hallucis Longus
Extensor Digitorum Longus
ANTERIORCOMPARTMENT
-
Anteriortointerosseousmembrane
Mostsusceptibletocompartmentsyndrome
Deepfibularnerveforallmuscles
Dorsiflexormuscles:
1.TibialisAnterior
2.ExtensorDigitorumLongus
3.ExtensorHallucisLongus
4.Fibularistertius
ANTERIORCOMPARTMENT(superficialmuscles)
1. TIBIALISANTERIOR
O:Tibia–lateralcondyle&superior/lateralshaft
Interosseusmembrane
(Onproximallateralsurfaceoftibia)
I:Medialcuneiform&base1stmetatarsal
A:DORSIFLEXION&INVERSIONofthefoot
Nerve:DeepFibular(L4,L5)
Theretinaculumholdsdown
tendons/otherstructures
2. EXTENSORDIGITORUMLONGUS
O:Tibia–lateralcondyle
Fibula–superiormedialsurface,
Interosseousmembrane
I:Middle&distalphalanges2-5digits
A:DORSIFLEXIONandEXTENSIONTOES2-5
Nerve:DeepFibular(L4,L5)
3. EXTENSORHALLUCISLONGUS(Hallucis=BIGTOE)
BetweenTibialisAnterior&ExtensorDigitorumLongus
O:Fibula–anteriorsurface
Interosseousmembrane
I:Dorsalbaseofdistalphalanxofhallux
A:DORSIFLEXIONoffoot,EXTENSIONofhallux
N:DeepFibular(L5,S1)