What is the origin of the Biceps Femoris long head?

• A. Iliac crest
• B. Anterior superior iliac spine
• C. Ischial tuberosity
• D. Pubic tubercle

Answer: (C)

The main idea here is the proximal attachment of the long head of the biceps femoris. It originates from the ischial tuberosity, the sit bone on the posterior pelvis. This origin is typical for the hamstring long head, with the short head arising from the femur itself, and together they form the tendon that crosses the knee to help flex it. The iliac crest, the anterior superior iliac spine, and the pubic tubercle are attachment sites for other muscles or pelvic structures (for example, the ASIS is linked with sartorius and tensor fasciae latae, and the iliac crest attaches various gluteal muscles). So, ischial tuberosity is the correct origin for the long head of the biceps femoris.