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The thigh is the area between the hip and the knee, and it contains some of the body's largest muscles. The thigh muscles can be divided into three main groups, depending on their location: posterior, medial, and anterior. These muscles are prone to injury, especially in athletes, as they help us bend, flex, and rotate our lower bodies. The muscles in the anterior compartment of the thigh, for example, help to extend the leg at the knee joint, allowing us to kick, run, and jump. The muscles in the posterior compartment are the hamstring muscles, which include the semimembranosus, semitendinosus, and biceps femoris. The medial compartment muscles include the pectineus, adductor magnus, adductor longus, adductor brevis, and gracilis.
| Characteristics | Values |
|---|---|
| Location | Front, back and inside of the thigh |
| Bone | Femur |
| Function | Bend, extend, flex, rotate, bear weight, balance, move legs inward |
| Groups | Posterior, medial, anterior |
| Posterior muscles | Hamstrings (semitendinosus, semimembranosus, biceps femoris) |
| Medial muscles | Adductors (adductor longus, adductor magnus, gracilis, obturator externus) |
| Anterior muscles | Quadriceps (rectus femoris, vastus lateralis, vastus intermedius, vastus medialis) |
| Other anterior muscles | Sartorius, pectineus, iliopsoas |
| Prone to | Injury, strain, contusions, tendonitis |
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What You'll Learn
The thigh's three muscle groups
The thigh muscles are some of the largest muscles in the body and are prone to injury. They can be divided into three main groups, depending on their location: posterior, medial, and anterior.
The posterior thigh muscles run down the back of the thigh, from the hip to just below the knee. They include the hamstrings: semitendinosus, semimembranosus, and biceps femoris. The hamstrings allow you to extend your hip and flex your knee.
The medial thigh muscles are on the inside of the thigh, starting at the pelvis and extending to the femur. These include the adductors: adductor longus, adductor magnus, adductor brevis, gracilis, and obturator externus. The adductors allow you to bring your thighs together and help with balance, keeping your hips and legs aligned, and enabling rotation.
The anterior thigh muscles are at the front of the thigh, starting at the pelvis and femur and extending down to the kneecap and shin bone. They include the quadriceps: vastus lateralis, tensor of the vastus intermedius, vastus intermedius, vastus medialis, and rectus femoris. The quadriceps help you flex your hip or extend your knee.
The three muscle groups in the thighs, therefore, consist of the hamstrings, adductors, and quadriceps.
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Anterior thigh muscles
The thigh muscles can be divided into three main groups, depending on their location: posterior, medial, and anterior. The anterior thigh muscles are at the front of the thigh, starting at the pelvis and femur and extending down to the kneecap (patella) and shin bone (tibia). They include the quadriceps, which is made up of four muscles: vastus medialis, vastus lateralis, vastus intermedius, and rectus femoris. The quadriceps femoris is the most notable member of the anterior thigh muscle group and is one of the most powerful muscles in the body.
The quadriceps femoris crosses both the hip and knee joints, providing strong extension of the leg and flexion of the hip. Its distal tendon is the main component of the patellar ligament, which holds the kneecap in place, thus stabilising the knee joint. The quadriceps femoris connects to the patella via the quadriceps tendon, which then extends to insert at the tuberosity of the tibia. The vastus muscles are responsible for knee extension and stabilisation of the patella, while the rectus femoris is responsible for thigh flexion at the hip and knee extension. The vastus lateralis is the largest of the four muscles.
The muscles of the anterior thigh include two other members: the sartorius and the articularis genus muscles. The sartorius is the longest muscle in the human body, coursing obliquely from the side of the hip to the inner aspect of the leg. It acts on both the hip and knee joints, providing flexion of the knee and flexion and lateral rotation of the hip joint. The articularis genus muscle is a small muscle in the knee region responsible for stabilising the knee joint during extension.
The iliopsoas and pectineus muscles are also part of the anterior thigh, although they do not cross the knee joint. The iliopsoas muscle is responsible for flexion of the thigh and lateral rotation of the hip. It consists of two muscles: the psoas major and the iliacus, which both insert onto the lesser trochanter of the femur. The pectineus is a flat, quadrangular-shaped muscle that contributes to the floor of the femoral triangle. It is responsible for flexion, adduction, and medial rotation of the hip.
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Posterior thigh muscles
The thigh muscles can be divided into three main groups depending on their location: posterior, medial, and anterior. The posterior thigh muscles run down the back of the thigh, from the hip to just below the knee. These muscles include the hamstrings, which are made up of the semitendinosus, semimembranosus, and biceps femoris.
The biceps femoris is a two-headed muscle that runs superficially through the posterior thigh. The long head of the biceps femoris arises from the ischial tuberosity and sacrotuberous ligament, while the short head arises from the lateral lip of the linea aspera and lateral supracondylar line of the femur. The muscle fibres from both heads converge to form a conjoint aponeurotic sheet that inserts into the head of the fibula. The biceps femoris acts on the hip and knee joints, contributing to their extension and lateral rotation.
The semitendinosus is a long, fusiform muscle that runs in the posterior thigh, medial to the biceps femoris. It extends from the ischial tuberosity of the pelvis to the proximal end of the tibia, where it inserts via the pes anserinus. The semitendinosus is innervated by the tibial division of the sciatic nerve and vascularized by the deep femoral and medial circumflex femoral arteries. It acts as an internal rotator of the thigh and contributes to the flexion and stabilization of the knee joint.
The semimembranosus is a fusiform muscle that runs deep to the semitendinosus and medial to the biceps femoris. It originates from the ischial tuberosity of the pelvis and inserts into the medial condyle of the tibia. The semimembranosus is innervated by the tibial division of the sciatic nerve and receives its blood supply from the femoral and popliteal arteries. This muscle acts on both the knee and hip joints, contributing to their flexion and extension.
The posterior thigh muscles have a wide range of functions, including stabilizing the knee and pelvis, and enabling movements such as walking, running, jumping, and kicking. These muscles are prone to injuries, especially in athletes, due to the strain placed on them during activities such as running, jumping, and changing directions.
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Medial thigh muscles
The thigh muscles can be divided into three main groups based on their location: posterior, medial, and anterior. The medial thigh muscles are located on the inside of the thigh, starting at the pelvis and extending to the thigh bone (femur). These muscles are essential for normal gait and lower extremity functioning. They are also important for protecting the neurovascular structures as they pass from the proximal hip joint to the knee and lower leg.
The medial thigh muscles include the adductors, which are a group of five muscles: adductor longus, adductor brevis, adductor magnus, gracilis, and obturator externus. The adductor longus is a large, flat muscle that partially covers the adductor brevis and magnus. It originates from the pubis bone of the pelvis and attaches to the linea aspera of the femur. The adductor brevis, on the other hand, is a short muscle lying underneath the adductor longus. It originates from the body of the pubis and attaches to the linea aspera on the posterior surface of the femur. The adductor magnus is the largest muscle in the medial compartment of the thigh and is comprised of two parts: an adductor component and a hamstring component.
The gracilis is the most medial and superficial muscle in the medial compartment. It originates from the inferior rami of the pubis and descends down the medial aspect of the thigh, attaching to the tibial shaft. The obturator externus is one of the smaller muscles in the medial thigh and is located superiorly within the compartment. These muscles are all innervated by the obturator nerve, which arises from the lumbar plexus and provides motor innervation and sensation to the hip joint and medial thigh.
The medial thigh muscles work together to allow for adduction of the leg, bringing the thighs towards each other. They also help to keep the legs and hips in alignment and enable rotation through the hips and legs. Weak adductor muscles can lead to knee instability and an increased risk of strains or ""groin strains." Therefore, it is important to keep these muscles healthy and safe, especially for athletes who are prone to thigh muscle injuries.
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Common injuries
The thigh muscles are some of the largest muscles in the body and are prone to injury, especially in athletes. Running, jumping, and changing directions can put a lot of strain on the muscles of the thighs. The thigh muscles can be divided into three main groups, depending on their location: posterior, medial, and anterior.
Strains
Strains are a common injury, particularly among athletes who participate in sports. Strains usually occur when a muscle is stretched beyond its limit, tearing the muscle fibres. This injury frequently occurs near the point where the muscle joins the fibrous connective tissue of the tendon. A direct blow to the muscle can also cause a strain. The hamstring and quadriceps muscle groups are particularly at risk for muscle strains because they cross both the hip and knee joints. They are also used for high-speed activities, such as track and field events (running, hurdles, long jump), football, basketball, and soccer.
Contusions
Contusions are usually the result of a direct blow to the front of the thigh. You may develop a bruise or a haematoma (when blood pools under your skin).
Tendonitis
Tendonitis is the inflammation of the tendons that connect the quad muscles to the kneecap or hip. This can cause thigh pain and irritate muscles, putting additional pressure on them.
Cuts (Lacerations)
Open wounds that break the skin of the thigh can damage the quad muscles or tendon. A cut may be the result of a fall, car accident, or traumatic sports injury.
Adductor Muscle Injuries
The adductor longus is the most commonly injured adductor muscle. This muscle is thought to be most susceptible to overstretching during movements such as lunging for a ball or sidestepping an opponent in football or rugby. Injury may also be caused by sudden resistance to a strong adduction force, such as an opponent blocking forceful hip adduction in a block tackle.
Hamstring Injuries
Hamstring injuries are common in athletes. A study of athletes with grade I and II hamstring injuries showed that muscle volume reduction following the injury of the long head of the biceps was observed.
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Frequently asked questions
The thigh muscles can be divided into three main groups, depending on their location: posterior, medial, and anterior. The muscles in the anterior compartment of the thigh are innervated by the femoral nerve and act to extend the leg at the knee joint. The muscles in the posterior compartment are the hamstring muscles, and the medial compartment muscles are pectineus, adductor magnus, adductor longus, adductor brevis, and gracilis.
The muscles in the thigh are responsible for several functions, including bending and extending the hips and knees, balancing, and rotating the legs inward. The thigh muscles also bear most of the body's weight and keep the hips and legs aligned.
The thigh contains some of the largest muscles in the body, including the hamstrings, which run down the back of the thigh, and the quadriceps, which are a group of muscles at the front of the thigh.
Thigh muscles are prone to injury, especially in athletes who run, jump, and change directions. To keep thigh muscles healthy, it is important to perform exercises that strengthen the muscles and improve flexibility.
