Hamstring muscles

Hamstring Muscles

The Hamstring Muscles (pronunciation: /ˈhæmˌstrɪŋ/) are a group of three posterior thigh muscles in between the hip and the knee. The term "hamstring" originates from the old English hamm, meaning thigh, and streng, meaning string.

Anatomy

The hamstring is composed of three muscles: the Biceps Femoris, Semimembranosus, and Semitendinosus. These muscles are responsible for the flexion of the knee and extension of the hip joint.

Biceps Femoris

The Biceps Femoris is a two-part muscle including a long head and a short head. The long head originates from the Ischial Tuberosity and the short head from the Femur.

Semimembranosus

The Semimembranosus is the most medial of the three hamstring muscles. It originates from the Ischial Tuberosity and inserts on the medial condyle of the Tibia.

Semitendinosus

The Semitendinosus, located between the other two hamstring muscles, also originates from the Ischial Tuberosity and inserts on the upper medial surface of the Tibia.

Function

The hamstring muscles play a crucial role in many daily activities such as walking, running, and jumping. They are responsible for knee flexion, hip extension, and help in maintaining balance of the trunk.

Related Terms

• Ischial Tuberosity
• Femur
• Tibia
• Knee Flexion
• Hip Extension

See Also

• Quadriceps
• Gastrocnemius
• Soleus Muscle

External links

• Medical encyclopedia article on Hamstring muscles
• Wikipedia's article - Hamstring muscles

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