Logan Steele
Hamstring muscles are skeletal muscles that run down the back of the thigh, helping to control the hips and knees. They are essential for everyday movements such as standing, walking, running, and climbing stairs. The hamstring muscle group includes three large muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles start at the bottom of the pelvis on a bone called the ischial tuberosity and attach to different points on the lower leg. Hamstring injuries are common in sports, especially those involving sprinting and deep squats.
| Characteristics | Values |
|---|---|
| Location | Back of the thigh |
| Type of Muscle | Skeletal |
| Number of Muscles | 3 |
| Muscle Names | Semitendinosus, Semimembranosus, Biceps Femoris |
| Muscle Attachments | Sit bones (ischial tuberosities) at the bottom of the pelvis |
| Muscle Functions | Extend the hip, flex the knee, rotate the lower leg |
| Muscle Strains | Pulled hamstring, partial tear, complete tear |
| Muscle Injuries | Most common sports injury |
| Muscle Imaging | Ultrasound, MRI |
| Muscle Recovery | Nonsurgical treatments, surgery |
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What You'll Learn
- The biceps femoris attaches to the tibia, fibula and femur
- The semitendinosus attaches to the tibia and sit bones
- The semimembranosus attaches to the tibia
- Hamstring muscles originate from the ischial tuberosity of the pelvis
- Avulsion fractures can occur when a fragment of bone attached to a tendon is pulled away
The biceps femoris attaches to the tibia, fibula and femur
The hamstring muscles are skeletal muscles located at the back of the thigh. They are involved in many leg movements, such as walking, climbing stairs, and running. The three hamstring muscles are the biceps femoris, semitendinosus, and semimembranosus.
The biceps femoris is a long muscle in the posterior compartment of the thigh, responsible for movement at both the hip and knee joints. It has two heads, a long head and a short head, that originate from different locations but share the same insertion site. The long head is considered part of the hamstring muscle group, while the short head is sometimes excluded as it only causes knee flexion and is activated by a separate nerve.
The long head of the biceps femoris originates from the ischial tuberosity, which is a rounded portion of the pelvic bone. The short head originates from the linea aspera of the femur, or the thighbone, which is a lip or ridge at the posterior shaft of the femur. The muscle fibres from the short head join the aponeurotic sheet, forming the common tendon that inserts into the lateral aspect of the head of the fibula, or the outer lower leg bone.
The biceps femoris tendon joins with the lateral collateral ligament to insert into the fibula. At its insertion, the tendon divides into two portions, which embrace the fibular collateral ligament of the knee joint. This joining of tendons is commonly referred to as the conjoined tendon of the knee. Additionally, a few fibres attach to the adjacent tibial condyle, resulting in the attachment of the biceps femoris to the tibia, fibula, and femur.
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The semitendinosus attaches to the tibia and sit bones
The semitendinosus is a long, superficial muscle in the back of the thigh. It is one of three posterior thigh muscles that make up the hamstring muscles. The other two are the semimembranosus and the biceps femoris. The semitendinosus is attached to the medial (inner) side of the sit bones and divides into two sections by a visible ridge of tendonous tissue called a raphe.
The semitendinosus runs down the middle of the back of the thigh, crosses to the inside of the knee, and attaches to the upper part of the tibia (shinbone). The muscle is fusiform and ends a little below the middle of the thigh in a long, round tendon which lies along the medial side of the popliteal fossa. It then curves around the medial condyle of the tibia and passes over the medial collateral ligament of the knee joint, from which it is separated by a bursa. The semitendinosus tendon takes an inferomedial course, passing posteriorly to the medial condyle of the femur and laterally to the medial condyle of the tibia.
The pes anserine tendon is formed by the semitendinosus joining with the sartorius and gracilis muscles on the front and side of the tibia. It is also connected to the deep fascia of the leg. The semitendinosus is innervated by the tibial division of the sciatic nerve (L5-S2). This muscle is supplied by branches from three large arterial sources: the femoral artery, the internal iliac artery, and the popliteal artery.
The semitendinosus is involved in knee flexion and hip extension. It is a prime mover, extending and internally rotating the thigh, flexing and internally rotating the leg. It also has a postural role, stabilising the pelvic girdle.
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The semimembranosus attaches to the tibia
The hamstring muscles are skeletal muscles found at the back of the thigh. They are used for walking, climbing stairs, running, jumping, and performing many other leg movements. The three hamstring muscles are the biceps femoris, semitendinosus, and semimembranosus.
The semimembranosus muscle is the most medial of the three hamstring muscles in the thigh. It is wider, flatter, and deeper than the semitendinosus muscle, with which it shares very close insertion and attachment points. The semimembranosus muscle originates from a small facet on the rough superolateral surface of the ischial tuberosity. The tendon of the semimembranosus appears at the level of the mid-thigh and continues caudally toward the point of insertion at the medial condyle of the tibia.
The distal semimembranosus tendon has six insertions: direct arm, anterior arm, posterior oblique ligament extension, oblique popliteal ligament extension (capsular arm), distal tibial expansion (popliteus aponeurosis), and meniscal arm. The anterior arm attaches to the tibia deep to the medial collateral ligament. The semimembranosus is also connected to the posterior capsule and lateral meniscus.
The semimembranosus is involved in hip extension and knee flexion. It works together with the other hamstring muscles to carry out its function. For example, when the feet are firmly planted on the ground, the semimembranosus causes extension at the hip, pulling the upper torso into an erect position. The semimembranosus also plays a role in protecting the posterior horn of the medial meniscus during knee flexion.
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Hamstring muscles originate from the ischial tuberosity of the pelvis
The hamstring muscles are skeletal muscles located at the back of the thigh. They are involved in many leg movements, including walking, climbing stairs, and running. The hamstring muscles are also crucial in performing daily activities like jumping and controlling some gluteus movements.
The hamstring muscles comprise three posterior thigh muscles: the semimembranosus, semitendinosus, and biceps femoris. The short head of the biceps femoris is an exception, as it originates from the lateral lip of the femoral linea aspera, distal to the femoroacetabular joint. All other hamstring muscles, including the long head of the biceps femoris, originate from the ischial tuberosity of the pelvis.
The ischial tuberosity is a part of the pelvis bone, specifically the lower and lateral portion of the pelvis. It serves as the attachment site for the hamstring muscles. The hamstring muscles arise from a conjoint muscle tendon that originates from the ischial tuberosity. This tendon is known as the common tendon of the two heads of the biceps femoris, which can be palpated in the posterior knee region.
The hamstring muscles play an important role in knee flexion and hip extension. They contract when the knee is bent and lengthen when the knee is extended. The hamstrings also help to decelerate the forward motion of the tibia during walking, acting as antagonists to the quadriceps muscle group. This complex interplay between the hamstrings and quadriceps is crucial for maintaining stability and controlling movements during various activities.
Injuries to the hamstring muscles are common in sports and can occur due to excessive muscle strain during sprinting or extensive hip flexion while the knee is extended. Strains can range from mild to severe, including pulled muscles, partial tears, and complete tears. Treatment options for hamstring injuries depend on the severity and may include rest, pain management, and physiotherapy, or surgical intervention in more serious cases.
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Avulsion fractures can occur when a fragment of bone attached to a tendon is pulled away
Hamstring muscles are skeletal muscles located at the back of the thigh. They are involved in various leg movements, such as walking, climbing stairs, and running. The three hamstring muscles are the biceps femoris, semitendinosus, and semimembranosus.
Avulsion fractures commonly occur in young athletes during activities that involve quick movements and sudden changes in direction, such as sprinting, hitting, or sliding. An avulsion fracture happens when a fragment of bone attached to a tendon or ligament is pulled away from the main part of the bone. This type of fracture can occur when there is a sudden, acute event with a strong tensile force applied to the bone through the soft tissue, or when chronic repetitive stresses cause the tendon or ligament to pull away a piece of bone.
The symptoms of an avulsion fracture include sudden severe pain, muscle pain, a popping or cracking sound, pain that spreads to nearby areas, difficulty moving the affected limb, and limping or an inability to walk if the fracture is in or near the leg.
Treatment for avulsion fractures typically involves resting the injured area and applying ice. Most avulsion fractures do not require surgery, but in cases where the fragment has been pulled more than a few centimeters away from its original position, surgery may be necessary. Surgeons can perform open reduction, where an incision is made and the bones are realigned, or internal fixation, where metal hardware such as pins, plates, screws, or rods are used to align the bones.
Avulsion fractures can occur in various bones of the body, including the elbow, ankle, foot, knee, finger, wrist, pelvis, hip, and spine. Athletes and performers, such as football players, ballet dancers, gymnasts, and skiers, are particularly susceptible to avulsion fractures due to the nature of their activities.
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Frequently asked questions
The hamstring muscles attach to the sit bones (ischial tuberosities) at the bottom of the pelvis. They cross the knee joint and end at the lower leg.
The hamstring muscle group includes three large muscles: the biceps femoris, semitendinosus, and semimembranosus.
Hamstring muscles are essential for standing, walking, running, and other leg movements such as climbing stairs, doing squats, and jumping. They help control the hips and knees.
