Biceps Femoris - Muscle Physiology & Functional Anatomy

 

Biceps Femoris Muscle

Anatomy

 

Origin:

  • Long Head

    • Ischial tuberosity, part of the sacrotuberous ligament (tendon also common to semitendinosus)

  • Short Head

    • Lateral lip of the linea aspera below the gluteal tuberosity (between the adductor magnus & vastus lateralis)

Insertion:

  • Long Head

    • Fibular head (primarily) & lateral collateral ligament and lateral tibial condyle

  • Short Head

    • Styloid process of head of fibula. lateral collateral ligament and lateral tibial condyle



Major Arteries:

  • Inferior gluteal artery

  • Popliteal artery

  • Perforating arteries

 

Neural Innervation:

  • Long Head

    • Tibial portion of sciatic nerve

  • Short Head

    • Common peroneal portion of sciatic nerve (both L5 & S1)

 

 

Trigger Points:

Hamstrings Trigger Points

 

Physiology

 

Concentric Functions:

  • Long Head

    • Knee flexion & tibial external rotation

  • Short Head

    • Accelerates knee flexion & tibial external rotation

 

Eccentric Functions:

  • Long Head

    • Decelerates knee extension, hip flexion & tibial internal rotation at mid-stance of the gait cycle

    • Assists in deceleration of anterior rotation of the pelvis

    • Assists in dynamic stabilization of the lumbo-pelvic-hip complex

  • Short Head

    • Decelerates knee extension & tibial internal rotation at mid-stance of the gait cycle

 

Isometric Function:

  • Long Head

    • Assists dynamically stabilize the lumbo-pelvic-hip complex during functional movement

  • Short Head

    • Assists dynamically stabilize the lumbo-pelvic-hip complex during functional movement patterns

Related Muscles


Antagonist:

Exercises:

 

 


More Images of the Biceps Femoris Muscle

Biceps Femoris Heads

Cross Section of Biceps Femoris

Shortened and Tight Biceps Femoris

Shortened Biceps Femoris


More Information about the Biceps Femoris Muscle

The biceps femoris muscle is one of the three hamstrings.  The long head is biarticulate meaning it is involved in movement of 2 joints in the case of the biceps femoris, the hip & the knee.

 

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