Biceps femoris muscle

The biceps femoris muscle is a muscle of the posterior thigh. It is one of the three hamstring muscles, the others being the semitendinosus and semimembranosus. The biceps femoris has two parts: the long head and the short head.

Structure

The biceps femoris muscle has two heads of origin:

• The long head originates from the ischial tuberosity of the pelvis.
• The short head originates from the linea aspera on the posterior surface of the femur.

Both heads of the biceps femoris muscle insert into the head of fibula.

Innervation

The biceps femoris muscle is innervated by the sciatic nerve. The long head is innervated by the tibial division of the sciatic nerve, while the short head is innervated by the common fibular division of the sciatic nerve.

Blood Supply

The blood supply to the biceps femoris muscle is provided by the perforating arteries of the deep femoral artery.

Function

The primary functions of the biceps femoris muscle include:

• Knee flexion
• Hip extension

Additionally, the biceps femoris muscle plays a role in lateral rotation of the knee when it is flexed.

Clinical Significance

Injuries to the biceps femoris muscle, such as hamstring strains, are common in athletes. These injuries can result from excessive stretching or overuse.

See Also

• Hamstring muscles
• Semitendinosus
• Semimembranosus
• Sciatic nerve
• Knee flexion
• Hip extension

‎

---

Translate: - East Asian 中文, 日本, 한국어, South Asian हिन्दी, தமிழ், తెలుగు, Urdu, ಕನ್ನಡ, Southeast Asian Indonesian, Vietnamese, Thai, မြန်မာဘာသာ, বাংলা
European español, Deutsch, français, Greek, português do Brasil, polski, română, русский, Nederlands, norsk, svenska, suomi, Italian
Middle Eastern & African عربى, Turkish, Persian, Hebrew, Afrikaans, isiZulu, Kiswahili,
Other Bulgarian, Hungarian, Czech, Swedish, മലയാളം, मराठी, ਪੰਜਾਬੀ, ગુજરાતી, Portuguese, Ukrainian