Leg & Ankle OIA Flashcards
TA
Origin: lateral condyle of tibia
Insertion: medial cuneiform and base of metatarsal I
Innervation: deep fibular (L4-S1)
Main action: DF and INV of foot
Extensor hallucis longus
Origin: middle medial surface of fibula and interosseous membrane
Insertion: base of distal phalanx of great toe
Innervation: deep fibular nerve (L4-S1)
Main action: EXT of great toe and DF of foot
Extensor digitorum longus
Origin: medial surface of fibula and lateral tibial condyle
Insertion: distal and middle phalanges of lateral four toes
Innervation: deep fibular nerve (L4-S1)
Main action: EXT of lateral 4 toes and DF of foot
Fibularis tertius
Origin: distal part of the anterior surface of fibula
Insertion: dorsomedial surface of base of metatarsal V
Innervation: deep fibular nerve (L3-S1)
Main action: DF and EV of foot
Fibularis longus
Origin: upper lateral surface of fibula and head, and interosseous membrane
Insertion: base of metatarsal I and M. Cuneiform
Innervation: superficial fibular nerve (L4-S1)
Main action: EV and PF of foot
Fibularis brevis
Origin: lateral distal surface of shaft of fibula
Insertion: lateral tubercle at base of metatarsal V
Innervation: superficial fibular nerve (L4-S1)
Main action: EV of foot and PF
Gastroc
Origin: upper posterior medial and lateral surfaces of femoral condyles
Insertion: calcaneal tendon - calcaneus
Innervation: tibial nerve (S1, S2)
Main action: PF foot and flexes knee
Plantaris
Origin: lateral supracondylar line of femur
Insertion: calcaneal tendon - calcaneus
Innervation: tibial nerve (S1-S2)
Main action: PF foot and flexes knee
Soleus
Origin: soleal line and medial border of tibia; posterior aspect of fibular head, neck and proximal shaft
Insertion: calcaneal tendon - calcaneus
Innervation: tibial nerve (S1 - S2)
Main action: PF foot
Popliteus
Origin: lateral surface of femoral condyle
Insertion: posterior surface of proximal tibia
Innervation: tibial nerve (L4-S1)
Main action:
-close chain: laterally rotates femur (unlocks knee)
-open chain: medially rotates the tibia
Flexor digitorum longus
Origin: medial side of posterior surface of tibia
Insertion: distal phalanges of the lateral 4 toes
Innervation: tibial nerve (L4-S2)
Main action: flexes lateral 4 toes
Flexor hallucis longus
Origin: inferior 2/3 of posterior surface of fibula and interosseous membrane
Insertion: plantar surface of distal phalanx of great toe
Innervation: tibial nerve (L4-S2)
Main action: flexes great toe, INV and PF
TP
Origin: posterior surface of interosseous membrane and shafts of tibia and fibula
Insertion: tuberosity of navicular and medial cuneiform
Innervation: tibial nerve (L5, S1)
Main action: INV and PF of foot
