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10 Cards in this Set
- Front
- Back
action of the muscles
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- only two muscles
- evert the foot |
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boundries
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- fibula
- anterior and posterior intermuscular septa - ends at the superior fibular retinaculum |
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common synovial sheath
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- fibularis longus and brevis enter a common synovial sheath that passes between the retinaculum and the lateral malleolus
- common sheath then splits allowing the two tendons to travel separately under the inferior fibular retinaculum |
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tendon of the fibularis longus
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- utilizes grooves on the calcaneus and then the cuboid to change directions
- reaches distal attachment on plantar surface of the base of the 1st metatarsal |
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tendon of the fibularis brevis
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- courses to its distal attachment at the tuberosity of the base of the 5th metatarsal
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special function of fibularis longus
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- both muscles evert the foot
- fibularus longus allows depression of the first metatarsal head to support push off in walking and running - this feature unique to the human foot |
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superficial fibular nerve
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- terminal branch of common fibular emerging near the head of the fibula
- travels along the intermuscular sptum and supplies both fibularis longus and brevis - pierces the deep fascia at distal third of the leg to become cutaneous - supplies the skin on the distal anterior leg and nearly all dorsum of the foot - crosses the ankle anterior to the lateral malleolus |
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artery
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- lateral compartment has no artery coursing through it
- supplied mostly by perforating branches of the fibular artery - runs in posterior compartment along posterior intermuscular spetum - may also receive perforating branches from the anterior tibial artery which penetrate the anterior intermuscular septum |
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injury to the superficial fibular nerve
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- can result from trauma to the fibular head
- symptoms would include weakness in eversion and parathesia along the distal anterior leg and dorsum of the foot |
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injury to the common fibular nerve
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- injury prior to division would include loss of dorsiflexion and eversion as well as increased parathesia in the lower leg and foot
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