OINA Compartments of the leg (semester 2 year 1) Flashcards
Tibialis anterior
Anterior compartment of the leg
O- Lateral condyle of the tibia, superior ½ of the lateral surface of the tibia and interosseous membrane
I-medial and inferior surface of the tibia and interosseous membrane
N-Deep fibular nerve
A-dorsiflexes ankle and inverts foot
Extensor Hallucis Longus
Anterior compartment of the leg
O- Middle part of the anterior surface of the fibula and adjacent interosseous membrane
I-Dorsal surface of the base of the distal phalanx, (1st digit)
N-Deep fibular nerve
A- Extends the great toe, dorsiflexes the ankle
Extensor digitorum longus
Anterior compartment of the leg
O- Lateral condyle of the tibia, superior 3/4 of the medial surface of the fibula, adjacent interosseous membrane
I-extensor expansion, middle and distal phalanges and lateral 4 toes
N- Deep fibular nerve
A-extends lateral 4 digits and dorsiflexes ankle
Fibularis tertius
Anterior compartment of the leg
O- inferior 1/3 of the anterior surface of the fibular and adjacent interosseous membrane
I-dorsum of the base of the 5th metatarsal
N-Deep fibular nerve
A-dorsiflexes ankle and aids in eversion
Fibularis longus
Lateral compartment of the leg
O- head and superior 2/3 of the lateral fibula
I-base of the 1st metatarsal and medial cuneiform
N-superficial fibular nerve
A- Everts foot, weak plantar flexor of the ankle, stabelises the leg on the foot
Fibularis brevis
Lateral compartment of the leg
O- inferior 2/3 of the lateral surface of the fibula
I- tuberosity on the lateral side of the base of the 5th metatarsal
N- superficial fibular nerve
A- Everts foot, weak plantar flexor of the ankle, stabelises leg on the foot
Gastrocnemius
Superficial aspect of the posterior compartment of the leg
O-
Lateral head:
Lateral side of the lateral condyle of the femur
Medial head:
Popliteal surface of the femur, superior to medial condyle
I-posterior surface of the calcaneus via the calcaneal tendon
N- Tibial nerve
A-plantar flexion of the ankle when knee extended, raises heel during walking, flexes the knee
Soleus
Superior aspect of the posterior compartment of the leg
O- posterior head and superior ¼ of the posterior fibula, soleal line and middle 1/3 od the medial border of the tibia, tendinous arch extending between bony attachments
I- posterior surface of the calcaneus via the calcaneal tendon
N- tibial nerve
A-Plantar flexes the ankle
Plantaris
Superficial aspect of the posterior compartment of the leg
O- inferior part of the lateral supracondylar line of the femur, oblique popliteal ligament
I-posterior surface of the calcaneus via calcaneal tendon
N-tibial nerve
A-weakly assists gastrocs in plantarflexing the ankle and flexing the knee
Popliteus
Deep part of the posterior aspect of the leg
O- lateral surface of the lateral condyle of the femur and lateral meniscus
I- posterior durface of the tibia, superior to soleal line
N-tibial nerve
A-flexion of the knee, lateral rotation od the demur, medial rotation of the tibia when knee is flexed
Flexor hallucis longus
Deep part of the posterior compartment of the leg
O- inferior 2/3 od posterior surface of the fibula, some adjacent interosseous membrane
I-base of the distal phalanx of the toe
N-tibial nerve
A-flexes the great toe, weak ankle plantarflexor, supports medial longitudinal arch of foot
Flexor digitorum longus
Deep aspect of the posterior compartment of the leg
O-medial part of the posterior tibia, inferior to the soleal line and by a broad tendon to the fibula
I-base of the distal phalanges of the lateral 4 digits
N-Tibial nerve
A-Flexes lateral 4 digits, plantar flexes ankle, supports longitudinal arches of the foot
Tibialis posterior
Deep aspect of the posterior compartment of the leg
O-Interosseus membrane, posterior tibia inferior to soleal line, posterior fibula
I-tuberosity of the navicular, cuneiforms, cuboid, sustentacular tali of the calcaneus, bases of 2nd, 3rd and 4th metatarsals
N-tibial nerve
A- Plantarflexes the ankle and inverts the foot, supports medial longitudinal arch
