Plantaris
Leg & Ankle
Has one of the longest tendons in the body — surgeons harvest it for tendon grafts. About 10% of people are missing it.
Function
Weak plantarflexion and knee flexion
Origin
Lateral supracondylar line of femur
Insertion
Calcaneus (medial to Achilles tendon)
Innervation
Tibial nerve (S1-S2)