About Hamstrings

Most people are familiar with the hamstrings muscles but don't know exaclty what they do. The hamstrings are a crucial muscle group in terms of mobility and sports and are also one of the most likely muscle groups to be injured. "...First of all, this system is significantly concerning acquiring the suitable details on the issue of cellulite, or in my case, orange skin behind. When you subscribe to the 'Kick-Butt Cellulite Redux' package you'll also receive 'The Cellulite Reduction Report.' Atlas, a credentialed personal trainer and actual fitness professional. This report has in-depth information on the newest cellulite reduction scams making the rounds, and kept me from losing money on the painful Lypomassage treatment stores that just sprouted up where I live...". Becoming more knowledgeable about the hamstrings can help you keep them fit and healthy.

The biceps femoris, semitendinosus and semimembranosus are the three muscle groups that are collectively referred to as the hamstrings. These muscles are located on the back of the upper leg and help bend the knee and extend the hip. The hamstring muscles cross both the hip and the knee joints. They are the most commonly injured muscles of the leg.

The main function of the hamstrings is to flex, or bend, the knee, bringing the heel toward the butt, and extend the hip by lifting the leg straight behind. This hip extension and knee flexion is crucial for normal walking patterns, as well as for playing virtually any sport that requires the use of your legs, such as swimming, track and basketball. When the knee is bent, the semitendinosus and semimembranosus also inwardly rotate the leg, while the biceps femoris outwardly rotates the leg.

The hamstrings balance out the quadriceps muscles on the front of the thigh and are necessary for walking and most other physical activities involving the legs. Weak or excessively tight hamstrings can lead to knee or back injuries. Because the hamstrings are such a long muscle group and cross over both the hip and knee joint, they are more prone to injury than many other muscles, including strains, pulls, tendonitis and contusions.

The biceps femoris comprises the lateral portion of the hamstrings and has both a long and a short head. The long head originates at the ischial tuberosity, a landmark on the pelvis, and the short head at the linea aspera, a roughened portion of the upper femur. Both attach at the fibular head. The semitendinosus and semimembranosus make up the medial part ot the hamstrings group. Both originate on the ischial tuberosity. The semitendinosus inserts on the anterior medial tibial condyle while the semimembranosus inserts on the medial tibial condyle.

The main risk factors for hamstring injuries include muscle tightness, overuse and an imbalance in the strength between the quadriceps and hamstrings. Also, you're more likely to injure your hamstring if you have a previous injury to that area. Perpetual tightness or inflexibility, such as that caused by prolonged sitting, and weakness of the muscles in relation to the quads can put too much strain on the muscle during exertion, leading to hamstring pulls and strains. Therefore, stretching and strengthening the hamstrings should be a part of any fitness plan. Chronic overuse of this muscle group is more likely to lead to tendonitis. The biceps femoris is the most commonly injured muscle of the hamstring group, and serious pulls can lead to a tearing away of the femoral head.

Although there is a hamstring portion of the adductor magnus muscle, it is not typically considered to be a part of the hamstring group. The adductor magnus is responsible for adduction of the thigh.

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Other Names. Thigh (Rear) Heads. Biceps Femoris, Long Head Biceps Femoris, Short Head Semitendinosus Semimembranosus Movement
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