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Muscle Name: Hamstrings (Back of Thigh)

Medical Name:

• Hamstring Muscles

Other Names:

• None

Heads:

• Biceps Femoris (Long Head and Short Head)
• Semitendinosus
• Semimembranosus

Biceps Femoris

Movement:

• Flexion of the knee
  • Bending the leg
• Extension of the hip (Long Head)
  • Moving the thigh backward
• Lateral rotation of the knee (when the knee is flexed)
  • Rotating the lower leg outward

Attachment:

• Origin:
  • Long Head: Ischial tuberosity
  • Short Head: Linea aspera and lateral supracondylar line of the femur
• Insertion:
  • Head of the fibula

Semitendinosus

Movement:

• Flexion of the knee
  • Bending the leg
• Extension of the hip
  • Moving the thigh backward
• Medial rotation of the knee (when the knee is flexed)
  • Rotating the lower leg inward

Attachment:

• Origin:
  • Ischial tuberosity
• Insertion:
  • Medial surface of the proximal tibia (pes anserinus)

Semimembranosus

Movement:

• Flexion of the knee
  • Bending the leg
• Extension of the hip
  • Moving the thigh backward
• Medial rotation of the knee (when the knee is flexed)
  • Rotating the lower leg inward

Attachment:

• Origin:
  • Ischial tuberosity
• Insertion:
  • Posterior surface of the medial condyle of the tibia

Related Muscles:

• Quadriceps
• Gluteus Maximus
• Adductor Magnus
• Sartorius
• Gastrocnemius

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