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The Curious Bag
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Hamstrings are string-like tendons located on the back of the upper leg, which connects the tibia and fibula bones to the lower legs below the knee joint. The hamstring also refers to posterior thigh muscles or the tendons of the semitendinosus, semimembranosus and the biceps femoris.
Knee Flexion
The main function of the hamstring is to control the movement of the knee, during both daily activities such as isolated squats, jogging, walking and jumping.
Hip Extension
Hip extension is the other important function of the hamstrings, which occurs at the lockout during standing leg curls and lunge exercises.
Walking
The hamstring muscles control the body and eccentric movements, which allow you to start and stop an action such as walking, squatting exercises or running.
Acute Strains vs. Chronic Pulls
Acute strains to the hamstring are caused by overloading, falling or by being directly hit. Chronic pulls are generally caused by prior unhealed injuries or overuse.
Hamstring Injuries
A pulled hamstring injury is actually a tear of the biceps femoris, semitendinosus or the semimembranosus, common among athletes who are involved in vigorous activities such as soccer, football and basketball.
Source:
thefitnessblueprint.com: Hamstrings
criticalbench.com: Hamstring Muscles
thestretchinghandbook.com: Hamstring Anatomy
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