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10 Cards in this Set

  • Front
  • Back
action of the muscles
- only two muscles

- evert the foot
boundries
- fibula

- anterior and posterior intermuscular septa

- ends at the superior fibular retinaculum
common synovial sheath
- 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
tendon of the fibularis longus
- 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
tendon of the fibularis brevis
- courses to its distal attachment at the tuberosity of the base of the 5th metatarsal
special function of fibularis longus
- 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
superficial fibular nerve
- 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
artery
- 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
injury to the superficial fibular nerve
- 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
injury to the common fibular nerve
- injury prior to division would include loss of dorsiflexion and eversion as well as increased parathesia in the lower leg and foot