Maximus Gage
The thigh contains some of the largest muscles in the human body, which are located on the front, back, and inside of the thigh. These muscles are responsible for several important functions, including bending, flexing, and rotating the lower body. They also bear most of the body's weight, keeping the hips and legs aligned, and assisting with balance. The muscles that flex the thigh include the iliopsoas, pectineus, gracilis, sartorius, tensor fasciae latae, and quadriceps.
| Characteristics | Values |
|---|---|
| Muscle groups | Hamstrings, Adductors, Quadriceps, Pectineus, Iliopsoas, Sartorius |
| Hamstrings | Semitendinosus, Semimembranosus, Biceps Femoris |
| Adductors | Adductor longus, Adductor magnus, Adductor brevis, Gracilis, Obturator externus |
| Hip adductors | Gracilis, Pectineus, Adductor longus, Adductor brevis, Adductor magnus, Adductor minimus |
| Functions of hamstrings | Enable hip extension, knee flexion |
| Functions of adductors | Bring thighs together, enable rotation, maintain balance, keep hips and legs aligned |
| Functions of quadriceps | Flex hip, extend knee, absorb shock of heel strike, function as hip fixator or stabilizer |
| Functions of iliopsoas | Flex and rotate thigh at hip joint, stabilize lumbar spine |
| Functions of sartorius | Flex hip and knee joints, abduct thigh, rotate thigh laterally |
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What You'll Learn
Iliopsoas, sartorius, gracilis, pectineus, and adductor muscles
The iliopsoas muscle complex is made up of three muscles: the iliacus, psoas major, and psoas minor. This muscle system can function as a unit or as separate muscles. The iliopsoas is the primary hip flexor and assists in the external rotation of the hip joint, helping to maintain the strength and integrity of the hip joint. The psoas minor is only present in 60% to 65% of individuals.
The gracilis is a spiral unipennate muscle in the medial thigh compartment. It assists with hip adduction, knee flexion, and internal rotation. It is prone to strain injuries, which can lead to adductor tendinopathy, a common issue in soccer, hockey, football, and basketball athletes.
The pectineus is a transitional muscle between the anterior thigh and medial thigh due to its innervation from the femoral nerve and, in some cases, the obturator nerve. It assists in hip adduction and flexion. The pectineus can become injured through overstretching, such as stretching the leg too far out to the side or front of the body, or rapid movements like kicking or sprinting.
The sartorius muscle is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. The sartorius can move the hip joint and the knee joint, although its actions are weak, making it a synergist muscle. At the hip, it can flex, abduct, and laterally rotate the femur, and at the knee, it can flex the leg.
The adductor muscles of the hip are a group of muscles in the medial compartment of the thigh, primarily used for bringing the thighs together. They originate from the pubis and ischium bones and insert mainly on the medial posterior surface of the femur. The adductor muscles include the adductor longus, adductor brevis, adductor magnus, and adductor minimus.
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Hamstrings, semitendinosus, semimembranosus, and biceps femoris
The hamstrings are a group of three muscles: the biceps femoris, semitendinosus, and semimembranosus. They are located in the back of the thigh, starting at the pelvis and extending to the knee. They are responsible for various functions, including walking, climbing stairs, and performing squats and other leg movements.
The biceps femoris is situated on the outside of the back of the thigh. It flexes the knee, extends the thigh at the hip, and enables the rotation of the lower leg from side to side when the knee is bent. The semimembranosus is found on the innermost side of the back of the thigh. Similar to the biceps femoris, it flexes the knee joint, extends the thigh at the hip, and rotates the hip and lower leg. The semimembranosus also plays a crucial role in providing knee stability.
The semitendinosus is positioned between the semimembranosus and the biceps femoris. It shares the same functions as the semimembranosus, flexing the knee, extending the hip, and rotating the lower leg. The hamstring muscles contain thousands of long, elastic muscle fibres that facilitate leg muscle contractions and tightening.
These muscles are prone to injuries, especially in athletes who engage in running, jumping, and activities that involve quick directional changes. Hamstring injuries can occur due to the muscles being exposed to eccentric forces that simultaneously act across the hip and knee joints. Tendon injuries are common where the tendons attach to the ischium, resulting in tendonitis, which causes inflammation and pain.
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Adductor longus, adductor magnus, and adductor brevis
The thigh muscles are some of the largest muscles in the body and are located on the front, back, and inside of the thighs. They are responsible for several functions, including bending, extending, and rotating the hips and knees. The adductor muscles are a group of five muscles located in the medial compartment of the thigh, which adducts the thigh at the hip joint.
The adductor longus, adductor magnus, and adductor brevis are three of the six hip adductor muscles, along with the pectineus, gracilis, and adductor minimus. The adductor longus is the most proximal tendon amongst the adductors of the hip joint. It adducts and flexes the thigh at the hip and assists in medial rotation.
The adductor magnus is a large, triangular muscle situated on the medial side of the thigh. It consists of two parts: the pubofemoral portion (or adductor portion) and the ischiocondylar portion (or hamstring portion). The adductor magnus is a powerful adductor of the thigh, especially active when the legs are moved from a wide-spread position to a parallel position. It also contributes to hip extension and external rotation. The anterior fibres of the adductor magnus may assist in flexion, while the posterior fibres that arise from the ischial tuberosity may assist in extension.
The adductor brevis is one of the hip adductor muscles. It is a small, triangular muscle located in the medial compartment of the thigh. The adductor brevis works with the other adductor muscles to bring the thighs towards each other (adduction) and assist with balance, keeping the legs and hips in alignment, and allowing rotation through the hips and legs.
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Gluteus maximus and tensor fasciae latae
The gluteus maximus is the largest and most superficial of the gluteal muscles, producing the shape of the buttocks. It is the main extensor of the thigh and assists with lateral rotation, although it is only used when force is required, such as when running or climbing. The gluteus maximus is the chief antigravity muscle during sitting, counteracting and controlling the flexion of the hip. It also works to extend the hip when rising from a seated position, straightening from a bending position, walking upstairs, or running.
The gluteus maximus receives vascular supply from both the inferior and superior gluteal arteries. The inferior gluteal nerve innervates the gluteus maximus, and it is the only muscle innervated by this nerve.
The tensor fasciae latae (TFL) is a small muscle located in the proximal anterolateral thigh, between the superficial and deep fibres of the iliotibial (IT) band. It works in conjunction with the gluteus maximus, gluteus medius, and gluteus minimus in various hip movements, including flexion, abduction, and internal rotation. The TFL assists with knee flexion and lateral rotation through the attachment of the IT band to the tibia. It is clinically important for aiding pelvis stability while standing and walking.
The TFL is innervated by the superior gluteal nerve, originating from lumbar nerve 4, 5, and the first sacral nerve (L4-S1) roots. The TFL functions to tighten the fascia lata, abducting and medially rotating the lower limb.
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Psoas major and psoas minor
The psoas major is a long, thick, and fusiform muscle that lies lateral to the lumbar vertebrae and medial to quadratus lumborum. It originates from the T12-L4 vertebrae and ends by inserting into the lesser trochanter of the femur, after merging with the iliacus muscle. The psoas major flexes and laterally rotates the thigh at the hip joint.
The psoas minor is a thin, long, and fusiform muscle found in front of the psoas major. It is a variable muscle, present in only about 40% of people. It is a weak muscle, and its absence does not affect the body's functionality. The psoas minor assists in trunk flexion, allowing forward bending at the lumbar spine.
The psoas minor is located on the anterior aspect of the psoas major muscle, originating from the lateral bodies of the T12 and L1 vertebrae, as well as the intervertebral disc between them. It then extends inferiorly, tapering into a long, flat tendon. The tendon of the psoas minor inserts onto the pecten pubis and the iliopubic eminence through the iliopectineal arch.
The psoas minor is innervated by the anterior ramus of the spinal nerve L1, and its main blood supply comes from the lumbar arteries. Although not considered part of the iliopsoas muscle complex, the psoas minor functions alongside the psoas major and iliacus muscles to flex the hip and assist with flexion of the lumbar vertebral column.
The thigh muscles are responsible for several important functions, including bending and extending the hips and knees, moving the legs inward, and enabling flexion and rotation of the thighs at the hip joints. These muscles are prone to injury, especially in athletes, due to the strain from running, jumping, and changing directions.
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Frequently asked questions
The thigh muscles are responsible for bearing most of the body's weight. They also keep the hips and legs aligned and assist with balance. They are prone to injury, especially in athletes, due to the strain put on them by running, jumping, and changing directions.
The iliopsoas is the chief flexor of the thigh at the hip joint. Other muscles that flex the thigh include the gracilis, pectineus, adductor longus, adductor magnus, adductor brevis, adductor minimus, and obturator externus.
The thigh muscles can be divided into three main groups, depending on their location: posterior, medial, and anterior. Posterior thigh muscles include the hamstrings, which run down the back of the thigh. Medial thigh muscles are on the inside of the thigh and include the adductors. Anterior thigh muscles include the quadriceps, which is divided into three vasti muscles and the rectus femoris.
