functional anatomy of the leg Flashcards
anterior compartment muscles (4)
dorsiflexors
- tibialis ant
- EHL
- EDL
- fibularis tertius
tib anterior
dorsiflexes and supinates
EHL
extends IP joint of big toe, dorsiflexes ankle
EDL
extends MP joints of toes, dorsiflexes
fibularis tertius
pronates foot and dorsiflexes ankle
deep fibular n
motor: muscles in ant comp
sensory: web space btw first 2 toes
ant tibial A.
on to 2 branches of popliteal
main A to ant comp
lateral crural compartment muscles (2)
primarily pronate (plantar outward)/evert
- fibularis longus
- fibularis brevis
sup fibular N.
one of 2 branches of the common fib
supplies lateral comp muscles
sensory to dorsum except the web space btw the first 2 toes
main arteries to the post comp
there are none
3 post crural comp’s
superficial
deep
central
superficial post compartment (2)
plantar flexors
triceps surae muscles
triceps surae muscles
gastrocs: 2 joint, also flex knee
soleus
plantaris: weak 2 joint, short muscle, long tendon
deep post comp muscles (3)
toe flexors
popliteus: unlocks knee
FHL: IP joint
FDL: DIP joints
central post compartment muscles (1)
tibialis posterior
main supinator
tibial nerve
all muscles in post. compartment and all muscles of plantar foot
sensory: skin on sole of foot
post tibial A.
primary A of post leg
pulse from med malleolus
L5 lesion sensory
dorsum of foot
compartment syndrome
expansion of muscle mass pushing on fascia that divides the compartments
most common: ant compartment
usually an increase in tibialis ant that is responsible
muscle &/or N ischemia: pain in ant portion of leg
shin splints
also in ant comp
muscles expand, fascia stretches, results in tiny bone fractures along tibia
foot drop
common fib n damage, loss of function of dorsiflexors, slapping when walking
tibial N lesion
paralysis or weakness in sup post comp muscles
cant push off when stepping
dragged limb or exxagerated hip rotation
hopping test
