dorsum of foot-book Flashcards
what muscle takes partial origin from the deep surface of the frondiform ligament
extensor digitorum brevis
what tendon does the superomedial oblique band form a tunnel for?
tibialis anterior
the inferomedial oblique band attaches to what
plantar fascia, navicular tuberosity and medial cuneiform
extensor expansion is formed by what?
what is the proximal and distal part of the expansion called and what are they made from?
extensor digitorum longus and brevis
proximal part is called extensor sling made by interosseous muscles
Extensor wing-distal formed by lumbricals
what is the function of the extensor digitorum longus in regards to extensor expansion?
tightens sling and loosens wing
extension of MPJ, NOT IPJ extension
functions of lumbrical muscles in regards to extensor expansion
tighten wings, loosen slings
allow flexion at MPJ, while extending IPJ
Flexor digitorum longus contributes to function of extensor hood
extensor expansion of the hallux
has a wing and sling, but lumbricals and interossei do not contribute.
medial side it is formed by abductor hallucis, lateral side is formed by adductor hallucis and flexor hallucis brevis
how does the dorsalis pedis course down the foot from the leg (what structures does it run past)?
what muscles does it run between
anterior tibial artery–> dorsalis pedis artery when it passes transmalleolar line. crosses distally past talus, navicular, interediate cuneiform and based of 2nd met
extensor hallucis longus on the medial side and the tendon of extensor digitorum longus can be on the lateral side.
what blood supplies to head and neck of talus
proximal part of lateral tarsal artery
where does the arcuate artery typically originate from on the foot? how often in this case? what does it anastamose with
65% of cases, originate at level of 1st tarsometatarsal joint and runs laterally across the bases of 2nd 3rd and 4th met
anastamose with lateral tarsal and lateral plantar arteries
