What is the main function of the Popliteus muscle?
What is the main function of the Popliteus muscle?
Despite its small size, the popliteus is a major stabilizer of the knee. The popliteus is involved in both the closed chain phase and open-chain phase of the gait cycle. During the closed chain phase, which is when the foot is in contact with the ground, the muscle externally rotates the femur on the tibia.
What action does the Popliteus perform?
| Popliteus muscle | |
|---|---|
| Nerve | Tibial nerve |
| Actions | Medially rotates tibia on the femur if the femur is fixed (sitting down) or laterally rotates femur on the tibia if tibia is fixed (standing up), unlocks the knee to allow flexion (bending), helps to prevent the forward dislocation of the femur while crouching |
| Identifiers |
What is the innervation of the Popliteus muscle?
The popliteus muscle is innervated by tibial nerves (L4, 5 and S1). Muscular spasticity is common in post-stroke patients. The spastic lower extremity manifests with in-toeing of the lower leg due to shortening of the popliteus muscle acting as the medial rotator of the tibia.
What is the clinical significance of the popliteal fossa?
The popliteal fossa is a diamond-shaped depression located posterior to the knee joint. Important nerves and vessels pass from the thigh to the leg by traversing through this fossa. These include the two terminal branches of the sciatic nerve, the popliteal vessels and short saphenous vein.
What does popliteus mean?
noun, plural pop·lit·e·i [pop-lit-ee-ahy, pop-li-tee-ahy]. Anatomy. a thin, flat, triangular muscle in back of the knee, the action of which assists in bending the knee and in rotating the leg toward the body.
What is a popliteus?
The popliteus muscle runs diagonally across the back of the knee joint. This muscle rotates the lower leg and plays a role in bending (flexing) the knee. The popliteus muscle helps to stabilize the back and outer back of the knee and is most often injured in downhill skiing and long-distance running.
Is popliteus an intracapsular?
The popliteus is a small but important muscle of the knee. The popliteus tendon is intracapsular, but extra-articular and extrasy- novial. The popliteus is a major stabilizer of the posterolateral knee. Injuries of the popliteus are common and often occur with other posterolateral corner injuries.
What is the significance of the popliteus muscle to this anatomical arrangement?
The popliteus muscle plays an important role in the gait cycle by initiating the flexion of the fully extended (“locked”) knee. Thus, the popliteus is referred to as the “key to unlock the knee”. In addition, the popliteus muscle is the main stabilizer of the dorsal knee region.
What passes through popliteal fossa?
Popliteal vein- the small saphenous vein passes between the two heads of gastrocnemius to empty into popliteal vein. Tibial nerve– most superficial, branch of sciatic nerve. Common fibular nerve– most superficial, branch of sciatic nerve and travels along lateral margin of fossa.
What arteries are located in the popliteal fossa?
In the popliteal fossa, the deepest structure is the popliteal artery. It is a continuation of the femoral artery, and travels into the leg to supply it with blood. Fig 2 – The contents of the popliteal fossa.
What does the popliteal lymph nodes do?
Popliteal lymph nodes are deep structures encountered under the investing fascia of the leg, and they receive the lymphatic drainage of the deep structures of the distal leg and foot. Although infrequent, the lymphatic drainage from the skin is direct to these lymph nodes in some individuals.
What is the function of the popliteus muscle?
In addition, during the knee extension, the slight outward rotation of the tibia on the femur locks the knee joint (the so-called terminal rotation). The popliteus muscle is responsible for reversing this terminal rotation. This article will discuss the anatomy of the popliteus muscle.
Where is the popliteal fossa located in the knee?
The popliteus muscle is a small muscle that forms the floor of the popliteal fossa. It belongs to the deep posterior leg muscles, along with tibialis posterior, flexor digitorum longus and flexor hallucis longus. The popliteus muscle extends over the posterior aspect of the knee joint.
Is the popliteus tendon connected to the lateral capsule?
Knee stabilitiy, The popliteus tendon is frequently found to be connected to the lateral capsule. This gives the muscle a possible role in postero-lateral stability of the knee.
Where is the pancreas located in the body?
It plays an essential role in converting the food we eat into fuel for the body’s cells. The pancreas has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar. Location of the Pancreas The pancreas is located behind the stomach in the upper left abdomen.
