The popliteus is the smallest as well as most superior of the deep muscles inside the posterior portion of the leg. Through preventing lateral (external) rotation of the tibia at the femur it uncovers the prolonged knee on the beginning of flexion and also stabilizes the knee. It is interjected inside a broad triangular zone over the soleal line at the posterior surface of the tibia creates portion of the floor of the popliteal fossa, and also is flat and triangular in shape.
InnervationThe popliteus muscle is supplied via fibers of the tibial nerve, direct through a section of the nerve towards the tibialis posterior muscle and also in some cases from a section via the main nerve towards the knee joint. These nerve fibers emerge through the fourth as well as fifth lumbar along with the first sacral spinal nerves to the popliteus muscle.
Functions and Actions
- The popliteus muscle, as soon as the thigh is set but the leg is free to move, like whenever being seated upright, turns the tibia medially. This muscle turns the femur laterally over the tibia in order to "release" the knee joint, during weight supporting whenever the leg is set.
- The popliteus muscle has a mechanical drawback when it comes to generating knee flexion because of the angulation of its fibers along with their closeness towards the axis of turning of the knee.
- By having the leg free to move, the popliteus muscle is activated via deliberate effort in order to create medial rotation of the leg at knee angles in between knee straight as well as 90 ° of flexion in the being seated and also prone positions.