Short head of biceps femoris

The short head of biceps femoris (BFsh) is one of the two heads of the biceps femoris muscle, which is part of the hamstring muscle group. The short head of biceps femoris arises from the lateral lip of the linea aspera, between the Adductor magnus and Vastus lateralis, extending up almost as high as the insertion of the Glutaeus maximus; from the lateral prolongation of the linea aspera to within 5 cm. of the lateral condyle; and from the lateral intermuscular septum.

The short head of the biceps femoris (BFsh) has several distinct components:

1. Proximal attachment: The BFsh attaches proximally to the tendon of the long head of the biceps femoris (BFlh).

2. Capsular arm: This component connects the BFsh to the knee joint capsule.

3. Confluens: The BFsh forms a confluence with the capsuloosseous layer of the iliotibial tract.

4. Direct arm: This part of the BFsh attaches directly to the fibula.

5. Anterior arm: This component extends anteriorly from the BFsh.

6. Lateral aponeurosis: The BFsh has a lateral aponeurosis that contributes to its structure.

The BFsh is quadrate in shape and has a direct attachment to the skeleton and the tendon of the BFlh. It is characterized by a pennate muscle architecture, which is typical of muscles that generate high force. The BFsh plays a role in knee flexion and lateral rotation of the leg