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11 Cards in this Set
- Front
- Back
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tibialis anterior
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- strongest dorsiflexor of the ankle
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extensor hallicus longus
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- lies between tibialis anterior and extensor digitorum longus within the anterior compartemtn
- fibularis tertius is a separate part of the extensor digitorum longus and is not always present |
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shin splints
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- result from repetitive microtrauma of the tibialis anterior
- pain results from small tears to the periosteum of the tibial shaft or the muscles deep fascial attachments |
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extensor retinacula
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- prevents bowstringing of the extensor tendons as they pass over the ankle
- superior retinacula is broad and runs between the distal tibial and fibula - inferior retinaculum- is y shaped and forms a strong loop around the tendons of extensor digitorum longus and fibularis tertius |
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tendons of anterior compartment
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- travel in several osseofibrous tunnels with surrounding synovial sheaths
- tibialis anterior and extensor hallucis longus travel in their own synovial sheaths - common synovial sheath encloses extensor digitorum longus and fibularis tertius |
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tendons of extensor digitorum longus
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- forms a membranous extensor expansion (dorsal hood) that divides into two lateral and one central band
- central band inserts into the base of the middle phalanx - two lateral bands insert into the base of the distal phalanx |
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deep fibular nerve
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- accompanies the anterior tibial artery into the anterior compartment to course between the tibialis anterior and extensor digitorum longus
- deep fibular exits anterior compartment crossing ankle to supply intrinsic muscle on dorsum foot and small area of skin between the 1st and 2nd toe |
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dorsalis pedis artery
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- from anterior tibial
- can be palpated at the ankle midway between the medial and lateral malleoli |
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deep fascia
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- expecially dense over anterior compartment
- inflammation withing this tight sapce may result in injury to the neurovascular structures or muscles - fasciotomy may be required to release pressure on these structures - inflammation and compression on structures within a fascial compartment is called compartment syndrome |
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Dorsiflexion of the ankle
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- is necessary for smooth walking
- injury to deep fibular nerve results in foot drop and steppage gait - injury can occur within the compartment (compartment syndrome) or external (trauma to the fibular head) |
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compression distal to innervation of the anterior compartment
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- may still result in loss of sensation and/or pain over the dorsum fo teh foot radiating into web space between 1st and 2nd toes
- may result from wearing tight shoes or boots (skiboot syndrome) |
