STRUCTURE AND POSITION 

•         Biceps Femoris Muscle is a long muscle with two heads. Long Head is part of the Hamstring Muscles.
•         It runs lateral to the Semitendinosus Muscle and has common origin with it too.

ATTACHMENTS 

•         Origin : Biceps Femoris Muscle arises from two heads. Long Head Arises from the Ischial Tuberosity of the Ischium. Short Head arises from the Linea Aspera and Lateral Supracondylar Ridge of the Femur.
•         It runs superficial to the Adductor Magnus and lateral to the Semitendinosus Muscle, downwards.
•         Insertion : Biceps Femoris Muscle is inserted into the Head of the Fibula Bone.

BLOOD SUPPLY 

Biceps Femoris Muscle receives blood from the Inferior Gluteal Artery, Perforating Arteries and the Popliteal Artery Branches.

NERVE SUPPLY

Long Head of the Biceps Femoris Muscle is innervated by the Tibial Nerve. Short Head is innervated by the Common Fibular Nerve.

ACTION

•         Biceps Femoris Muscle extends the Hip joint. (Long Head only)
•         It also flexes the Knee Joint.
•         It can laterally rotate the Knee Joint when in semiflexed position.