Lab List Thursday 6/19/14 Flashcards
Tibialis anterior origins (2)
- lateral condyle of tibia
- INTEROSSEOUS MEMBRANE
The muscles of the anterior compartment of the leg share a common origin, nerve, and artery (TA, EHL, EDL, fibularis terius), what are they?
Origin: Interosseous membrane
Nerve: Deep fibular nerve
Artery: anterior tibial artery
Tibialis anterior insertions (2)
- medial cuneiform
- base of first metatarsal
Anterior tibialis innervation
Deep fibular nerve (L4, L5)
Anterior tibialis main actions (3)
- dorsiflexes ankle
- inverts foot
- supports medial longitudinal arch of foot
Extensor hallucis longus origins (2)
- middle part of anterior surface of the fibula
- INTEROSSEOUS MEMBRANE
Extensor hallucis longus insertion
base of distal phalanx of great toe (dorsal aspect)
Extensor hallucis longus, extensor digitorum longus, and fibularis tertius segmental innervation
L5, S1 (deep fibular nerve)
Extensor hallucis longus actions (2)
- extends great toe
- dorsiflexes ankle
Extensor digitorum longus origins (3)
- lateral condyle of tibia
- superior 2/3 of anterior surface of fibula
- interosseous membrane
Extensor digitorum longus insertion
middle and distal phalanges of lateral four digits
Extensor digitorum longus actions (2)
- extends lateral four digits
- dorsiflexes ankle
Fibularis tertius origins (2)
- inferior third of anterior surface of fibula
- interosseous membrane
fibularius tertius insertion
dorsum of base of 5th metatarsal
Fibularis tertius actions (2)
- dorsiflexes ankle
- aids in eversion of the foot
Fibularis longus origin
head and lateral two thirds of lateral surface of the fibula
Fibularis longus insertion (2)
- base of 1st metatarsal
- medial cuneiform
Innervation of fibularis longus and fibularis brevis
Superficial fibular nerve (L5, S1, S2)
Main actions of fibularis longus and fibularis brevis (3)
- evert foot
- weakly plantarflex ankle
- FL supports transverse arch of foot
Fibularis brevis
middle part of lateral surface of fibula
Fibularis brevis insertion
base of 5th metatarsal (dorsal surface of tuberosity)
The leg is divided into three compartments:
- anterior (dorsiflexors or extensors)
- lateral
- posterior (plantarflexor or flexors)
The superior and inferior extensor retinaculum prevent ____ during dorsiflexion of the ankle joint
bow-stringing anteriorly
What are the muscles of the anterior compartment of the leg?
- tibialis anterior
- extensor digitorum longus
- extensor hallucis longus
- fibularis tertius
The 1 innervates the anterior compartment of the leg and the 2 supplies the anterior compartment of the leg
1) deep fibular nerve
2) anterior tibial artery
The anterior tibial artery turns into the the ___ inferiorly
dorsalis pedis artery
The superficial fibular nerve continues as a 1, supplying the skin of the distal part of the anterior surface of the leg and almost all the dorsum of the foot
cutaneous nerve
The lateral compartment of the leg is the 1 compartment, innervated by the 2 and containing the 3 and 4 muscles
1) “everter”
2) superficial fibular nerve
3) fibularis longus
4) fibularis brevis
There is no artery in the lateral compartment of the leg. It is supplied proximally by perforating branches of the 1 and distally by the perforating branches of the 2
1) anterior tibial artery
2) fibular artery
