Quiz 8 Flashcards
the anterior osteofascial compartment is found between what 2 borders of the tibia?
anterior and interosseous/lateral borders
what are the dermatomes of the anterior compartment?
L4 and L5
what nerves supply the L5 dermatome of the leg?
lateral sural cutaneous n. and superficial fibular n.
what nerve supplies the L4 dermatome of the leg?
saphenous n.
what are the contents of the anterior compartment?
tibialis anterior extensor hallucis longus extensor digitorum longus fibularis tertius ant. tibial artery and vein Deep fibular nerve
what are the general characteristics of the anterior compartment muscles? (there are 4)
1) they all dorsiflex the ankle 2) they are all innervated by the deep fibular n. 3) they all have site of origin on the interosseous membrane 4) they all receive their main blood supply from anterior tibial artery
when are the anterior compartment muscles especially active during the gait cycle?
heel strike/initial contact and swing phase
which anterior compartment muscle also inverts the foot?
tibialis anterior
where does tibialis anterior insert?
medial-plantar surface of both the medial cuneiform and MT 1 base
which anterior compartment muscle has origin on the lateral condyle of the tibia but not on the tibial shaft?
extensor digitorum longus
where does extensor digitorum longus insert?
middle and distal phalanges of digits 2-5
which anterior compartment muscle is the most lateral?
extensor digitorum longus
What Nerve contributes to the L3 and L4 Dermatome?
Saphenous Nerve
When walking, what muscle compartment stabilizes the foot from slapping the ground?
The Anterior Compartment
What Muscles attach to the medial cuniform ?
Tibialas Anterior and Fibularis Longus
what are the 2 parts of the extensor expansion?
extensor sling and extensor wing/hood
which muscle from the anterior compartment is deepest?
extensor hallucis longus
extensor hallucis longus contributes to the formation of what structure that covers the dorsum of the hallux?
extensor expansion
what is the role of the extensor expansion?
anchors the EHL tendon in place
what is the name of the medial tendinous slip originating from the EHL that inserts onto the dorsomedial aspect of the first MTPJ?
extensor hallucis capsularis
which anterior compartment muscle is capable of weak eversion?
fibularis tertius
what are the superior branches of the anterior tibial artery?
popliteal a. (origin) posterior tibial recurrent a. anterior tibial recurrent a.
what are the inferior branches of the anterior tibial artery?
dorsalis pedis (termination) anterior lateral malleolar a. anterior medial malleolar a.
what does the deep fibular nerve terminate into?
lateral and medial terminal branches
what does a lesion to the common fibular nerve cause?
high steppage gait (loss of dorsiflexion capabilities)
what is the crural fascia?
deep fascia completely surrounding the leg
the crural fascia contributes to the formation of what structures?
the 3 osteofacial compartments and retinacula
what 3 fibrous sheets divide the leg into 3 osteofascial compartments?
anterior crural intermuscular septum posterior crural intermuscular septum crural interosseous membrane