Compartments of the Leg Flashcards
what are the compartments of the leg?
Anteriro (extensor)
laterl (fibular)
posteriro (flexor)
divided by the interpossoesu membrane betwene the tibia and fibula
as well as two intramucualr septums of the legs (AC and PC)
the Anteriro compartment of the LEg role?
dorsiflexion!
what is this muscle
describe its proximal and distal attachments
TIbialis anterior
action- dorsilfexes ankle and inverts the foot
what is this muscles name and action- where does it attahc distally?
extensor digitorum longus
Actiomn- dorskflexs ankle and latreral 4 digits
(atataches to distal and middle phalanges)
what is this muscle?
action and proxima/distal attachment?
Extensor hallucis longus
Action- dorsiflexes ankle and extends the great toe!
proximal- anteiror surfacve of fibula and IM
Distal- dorsal aspect of base of diatl phalanx of great toe (hallux)
what is this small muscels name and action - where does it attach ?
Fibularis teritus
action- dorsiflexes ankle and aids in eversion of foot
Proximal- fibula and IM
distal- dorsum of base of 5th metatarsal
Label the muscles of the anteriro leg
which nerve innervates the Anteriro comparmetn of the Leg?
Deep fibular (perineal) nerve
accompanies the anteiror tibial artery between the TA and EDL
lesions here can cause foot drop and instability of ankel
what is the predominant action fo muscles in the lateral compartment of the leg
Evert the foot and weakly plantar flexes ankle
what is this muscle?
attachments?
proximall- fibula
distall
base of the 1st metatarsal and medial cuneform
what is this muscle?
attachments?
fibularis longus
attachment- fibula and laterasl side of base of 5th metatarsal
Label the lateral compartment of the leg
Describe the nerve supply to the lateral compartmetn of the leg
SUPERficial fibrular (peroneal) branch
Describe blood supply to the lateral compartment of the leg
no artery in the lateral comaprmtent
perforating branches supply blood to this compartment
Proximally- anteirro tibial artery
infeirro- fibular artery
what is the role of the superfical msucles of the posteriro compartmetn of the leg
describe there attachment distally
Plantar flexros
all atched distally on the posterior surface of calcaneus- via the calcaneal tendon (achilles
what is the role of gastrocenmius aside from plantar flexion?
flexes leg at the knee as it crosses the joint
Lateral head of gastrocnemius–? lateral condyle of femur
Medial head—-? popliteal surface of the femur (superro to medial condyle
where is soleus locted
proximal attachment?
mostly deep to gastrocenmius
hower it attaches to the fibula (soleal line)
what is very disticntive about plantaris muscle?
where does it atach?
Plantaris has a very Long tendon that lays above soleus
it is attached proximally to the lateral supraocndylar line of femur (oblique poplteal ligament)
Label this
what is the role of the deep muscles of the posteriro compartmetn of the leg?
contaisn mostly the plantar flexros
what is this muscle?
tibilasi posteriror
(alos inverts the foot)
attaches to the lateral condyle of femur and lateral meniscus
what is this muscle
Felxor hallucsu longus (FHL)
what is this muscle
where does it attached
Felxor digitorum lomngus
bases of distal phalanges of lateral four digits
Label the posteriro muscles of the leg (deep)
what nerve supploes the posteriro compartment of the leg
Tibial nerve
(larger of the terminal branches of the sciatic nerve. other is common fivular nerve)
which arteris supply the posterio comaprtment
Popliteal artery——> posteriro tibial
note on image how the anteiror tibila artery pireces the IM and moves to the anteriro
What is the tasal tunnel
fibre-ossoeus spoace on the posteromedial aspect of the anke
paassgae of nerevs and veessels
formed by mediala asepct of the tibia, taleus and calcaneus
roof tis formed by a felexor retinacumum
what are the Contents of the tarsal tunel?
Tom Dickk and very nervous harry
Tibilairs posteriro tendon
felxor digitroum longus
posteriro tibial aretery
posterio tibial vein
tibial nerve
flexor hallucis longus tendon
what is trasale tunnel syndrome
tibial nerev is entrapped as it passes through the tarsal tunnel
