Features of the leg Flashcards
What is the action and innervation of the tibialis anterior, extensor hallucis longus, extensor digitorum longus and fibularis tertius?
-Action
dorsiflex and invert the foot, and extend the toes
-innervation
the deep fibular nerve (branch of the common finular nerve)
What is the origin and insertion of the Tibialis anterior?
o: lateral surface of the tibia and adjacent interosseous membrane
i: medial cuneiform and base of the first metatarsal
What is the action of the Tibialis anterior?
Dorsiflexion and inversion of the foot and supporting the medial arch of the foot
What is the innervation of the Tibialis anterior?
deep fibular nerve
What is the blood supply of the Tibialis anterior?
Anterior tibial artery
What is the origin and insertion of the Extensor hallucis longus?
o: medial surface of fibula and adjacent surface of the interosseous membrane
i: base of distal phalanx of the great toe
What is the action of the extensor hallucis longus?
Extension of the great toe and dorsiflexion foot
What is the innervation of the Extensor hallucis longus?
deep fibular nerve
What is the blood supply of the Extensor hallucis longus?
Anterior tibial artery
What is the origin and insertion of the Extensor digitorum longus?
o: lateral condyle of the tibia and medial surface of the fibula
i: middle of the distal phalanges of the lateral four toes
What is the action of the Extensor digitorum longus?
extension of the lateral four toes and dorsiflextion of the foot
What is the innervation of the Extensor digitorum longus?
deep fibular nerve
What is the blood supply of the Extensor digitorum longus?
anterior tibial artery
What is the origin and innervation of the Fibularis tertius?
o: medial surface of the fibula
i: the fifth metatarsal
What is the action of the Fibularis tertius?
Dorsiflexion and evertion of the foot
What is the innervation of the Fibularis tertius?
deep fibular nerve
What is the blood supply of the Fibularis tertius?
Anterior tibial artery
What is the attachments of the Gastrocnemius?
- The lateral head originates from the lateral femoral condyle.
The medial head originates from the medial femoral condyle. - the two heads combine to form a single muscle belly
- distally, the muscle belly converges with the soleus muscle to form the calcaneal tendon. This inserts onto the calcaneus
What is the action of the Gastrocnemius?
Plantarflexion at the ankle joint and flexion at the knee joint
what is the innervation of the Gastrocnemius?
tibial nerve
What is the attachments of the Soleus?
Originates from the soleal line of the tibia and proximal fibula.
The muscle converges with the fibres of the Gastrocnemius to form the calcaneal tendon, which inserts onto the calcaneus
What is the action of the Soleus?
Plantarflexion of the foot at the ankle joint
What is the attachments of the Plantaris?
Originates from the lateral supracondylar line of the femur.
The fibres condense into a tendon which travels down the leg, between the gastrocnemius and soleus muscles.
It blends with the calcaneal tendon and inserts onto the calcaneus
What is the action of the Plantaris?
contributes to plantarflexion at the ankle joint and flexion at the knee joint
