This is a detailed, step by step, description on how to palpate biceps femoris muscle by Keith Bootsma, RMT.

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Origins:
1Long Head: Ischial Tuberosity
2Short Head: Linea Aspera

Insertions:
1Head of Fibula
2Lateral Condyle of the Tibia

Functions:
1Flexion of the Leg @ the Knee Joint
2Extension of the Thigh @ the Hip Joint
3Lateral Rotation of the Leg @ the Knee Joint

Nerve:
Tibial (Long Head) and Common Peroneal (Fibular) (Short Head) [Sciatic Nerve]

Activation: (Prone) Resist Flexion of Leg and Extension of Hip
Lengthening: (Supine) Extension of Leg and Flexion of Thigh