Anterior and Lateral Leg Flashcards
what is the crural fascia
deep fascia of the leg, covers leg muscles, part of the proximal attachment of the underlying muscles
thickens distally to form extensor retinaculum, prevents bowstringing during dorsiflexion
muscles of the the anterior compartment
tibialis anterior, extensor hallucis longus, extensor digitorum longus, fibularis tertius
actions of the anterior compartment
dorsiflexion and toe extension
origin of tibialis anterior muscle
lateral tibial condyle and superolateral 1/2 of tibia
insertion of tibialis anterior muscle
medial surface of first (medial) cuneiform and first metatarsal base
action of tibialis anterior muscle
dorsiflexion and inversion of foot, does not run to the digits
origin of extensor digitorum longus muscle
lateral tibial condyle, anterior fibular surface, interosseus membrane
insertion of extensor digitorum longus muscle
extension of the four tendons forms an extensor expansion over dorsum of lateral four proximal phalangs that divide into two lateral slips and central slip
action of extensor digitorum longus muscle
extends lateral four digits and dorsiflexion
fibularis tertius muscle origin
anterointerfior fibular surface and distally, dorsum of fifth metatarsal base
action of the fibularis tertius muscle
dorsiflexion and eversion
origin of extensor hallucis muscle
anteromedial fibular surface and interosseus membrane. medial to distal half of the proximal attachment of extensor digitorum longus
insertion of extensor hallucis muscle
base of distal phalanx of hallux
action of extensor hallucis muscle
extend hallux, dorsiflex ankle
what does deep fibular nerve supply
anterior compartment muscles, ankle joint and metacarpal phalangeal joints, dorsal instrinsic foot muscles, skin between first and second digits
anterior tibialis artery desends with what nerve
deep fibular nerve
where does the anterior tibialis artery end
ends at ankle between malleoli to become dorsalis pedis artery
lateral compartment of leg muscles
fibularis brevis, superficial fibular nerve, and fibularis longus muscle
origin of fibularis longus muscle
head and superolateral 2/3 of fibula, passes interior just posterior to lateral malleolus
insertion of fibularis longus muscle
runs obliquely and distally across sole of foot to attach distally to first metatarsal and medial cuneiform bone
action of fibularis longus muscle
eversion and plantar flexion
ridge on lateral surface of the calcaneus
fibular trochlea
cuboid bone articulates with what
posteriorly, calcaneus,
anteriorly, 4th and 5th metatarsal
medially, navicular and lateral cuneiform
what is the cuboid sulcus
groove for the fibularis longus
origin of fibularis brevis muscle
inferolateral 2/3 of tibia
insertion of fibularis brevis muscle
dorsal surface of tuberosity on lateral side of fifth metatarsal
action of fibularis brevis muscle
eversion and plantarflexion
superfical fibular nerve is branch of what nerve
common fibular nerve
what does the superficial fibular nerve supply
anteroinferior leg, nearly the entire dorsal surface of the foot
most of the dorsal aspect of the digits
what does common fibular nerve injury casue
paralysis of all anterior and lateral crural muscles
loss of dorsiflexion and eversion causes foot drog
difficult to have heel strike
high stepping out gait, waddling gait, or swing out gait
lateral compartment arterial supply
one one compartment without a a distinct arterial branch accompanying the compartment nerve, has fibular artery which is brach of the posterior tibial artery
crural fascia clinical anatomy
leg compartmental syndrome
septa are very tough
trauma may lead to hemorrhage, edema, and inflammation
intracompartmental pressure may lead to ischemia and permanent injury,
incising fascia may be performed to relieve pressure
what are shin splints
repettitive microtrauma to tibialis anterior
inducing small tears to periosteum over tibia
possibly tears to deep fascia
mild form of compartmental syndrome, swelling of tibialis anterior due to repettitive ground reaction force
