Actions/Origins/Insertions/Innervations (Post Midterm) Flashcards
What is the action of the gastrocnemius?
It plantar flexes the ankle when the knee is extended and flexes the knee joint
What is the proximal attachment of the medial and lateral head of the gastrocnemius?
Medial head: The popliteal surface of the femur, superior to the medial condyle.
Lateral head: The lateral aspect of the lateral condyle of the femur.
What is the distal attachment of the gastrocnemius?
The posterior surface of the calcaneus via the calcaneal tendon
What is the innervation of the gastrocnemius?
The tibial nerve (S1-S2)
What is the action of the soleus?
It plantar flexes the ankle
What is the proximal attachment of the soleus?
The posterior surface of the head of the fibula, the superior quarter of the posterior surface of the fibula, the soleal line, and the medial border of the tibia
What is the distal attachment of the soleus?
The posterior surface of the calcaneus via the calcaneal tendon
What is the innervation of the soleus?
The tibial nerve (S1-S2)
What is the action of the plantaris?
It weakly assists the gastrocnemius in plantar flexing the ankle
What is the proximal attachment of the plantaris?
The inferior end of the lateral supracondylar line of the femur and oblique popliteal ligament
What is the distal attachment of the plantaris?
The posterior surface of the calcaneus via the calcaneal tendon
What is the innervation of the plantaris?
The tibial nerve (S1-S2)
What is the action of the flexor digitorum longus?
It flexes the lateral four digits and plantarflexes the ankle
What is the proximal attachment of the flexor digitorum longus?
The medial part of the posterior surface of the tibia inferior to the soleal line and by a broad tendon of the fibula
What is the distal attachment of flexor digitorum longus?
The bases of the distal phalanges of the lateral four digits
What is the innervation of the flexor digitorum longus?
The tibial nerve (S2-S3)
What is the action of the flexor hallucis longus?
It flexes the great toe at all joints and weakly plantar flexes the ankle
What is the proximal attachment of the flexor hallucis longus?
The inferior 2/3 of the posterior surface of the fibula and inferior part of the interosseous membrane
What is the distal attachment of the flexor hallucis longus?
The base of the distal phalanx of the great toe (hallux)
What is the innervation of the flexor hallucis longus?
The tibial nerve (S2-S3)
What is the action of the tibialis posterior?
It plantarflexes the ankle and inverts the foot
What is the proximal attachment of the tibialis posterior?
The posterior surface of the tibia inferior to the soleal line, posterior surface of the fibula, and interosseous membrane
What is the distal attachment of the tibialis posterior?
Primarily to the tuberosity of the navicular, to the cuneiforms, cuboid, and bases of the 2nd-4th metatarsals.
What is the innervation of the tibialis posterior?
The tibial nerve (L4-L5)
What is the action of the popliteus?
It weakly flexes the knee and unlocks it by laterally rotating the femur on the fixed tibia
What is the proximal attachment of the popliteus?
The lateral surface of the lateral condyle of the femur and the lateral meniscus
What is the distal attachment of the popliteus?
The posterior surface of the tibia, superior to the soleal line
What is the innervation of the popliteus?
The tibial nerve (L4-S1)
What is the action of the tibialis anterior?
It dorsiflexes the ankle and inverts the foot
What is the proximal attachment of the tibialis anterior?
The lateral condyle and superior 2/3 of the lateral surface of the tibia and interosseous membrane
What is the distal attachment of the tibialis anterior?
The inferior and medial surfaces of the medial cuneiform and base of the 1st metatarsal
What is the innervation of the tibialis anterior?
The deep fibular nerve (L4-L5)
What is the action of the extensor digitorum longus?
It extends the lateral four digits and dorsiflexes the ankle
What is the proximal attachment of the extensor digitorum longus?
The lateral condyle of the tibia and superior 2/3 of the anterior surface of the fibula and interosseous membrane
What is the distal attachment of the extensor digitorum longus?
The middle and distal phalanges of the lateral four digits
What is the innervation of the extensor digitorum longus?
The deep fibular nerve (L5-S1)