Short Head of Biceps Femoris Muscle - Everything You Need To Know - Dr. Nabil Ebraheim скачать в хорошем качестве

Short Head of Biceps Femoris Muscle - Everything You Need To Know - Dr. Nabil Ebraheim

Dr. Ebraheim’s educational animated video describing the short head of the biceps femoris. The short head of the biceps femoris is an interesting and important muscle. The short head of the biceps femoris is innervated by the common peroneal nerve, which is a branch of the sciatic nerve. The long head of biceps femoris arises from the upper and medial part of the back of the ischial tuberosity. The short head of biceps femoris is not a part of the hamstrings since it does not originate from the ischial tuberosity. It functions only on the knee. Origin The short head of the biceps femoris arises from the femoral shaft from the middle third of the linea aspera lateral to the supracondylar ridge of the femur. Insertion It joins the long head of the biceps femoris in the distal thigh and it inserts at the fibular head. It is the most posterior structure inserted into the fibular head. Both heads of the biceps femoris are inserted into the head of the fibula along with the lateral collateral ligament and the popliteal fibular ligament. This is the arrangement of the structures attached to the fibular head from anterior to posterior: 1-Lateral collateral ligament. 2-Popliteofibular ligament. 3-Biceps femoris tendon. Be aware. Posterior to the biceps femoris, you will find the common peroneal nerve. Why is this muscle important? Because a high sciatic nerve lesion can mimic a common peroneal nerve injury at the fibular head. In both conditions, the patient will have foot drop, but the EMG will show abnormalities in the short head of the biceps femoris muscle if the lesion is a high sciatic nerve palsy. The lesion is not from injury to the common peroneal nerve at the fibular head, the lesion is from injury to the sciatic nerve because of EMG changes in the short head of the biceps. The short head of the biceps changes in the EMG will differentiate between a high lesion that will affect this muscle and low lesion that will not affect this muscle. Action of the short head of the biceps femoris Flexes the knee joint and laterally rotates the knee (external rotation) The nerve supply is the common peroneal nerve (L5, S1). Follow me on twitter: https://twitter.com/#!/DrEbraheim_UTMC