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The thigh muscles are some of the largest in the body and are responsible for several functions, including flexing the hip joint and extending the knee. The thigh contains several different muscles that help with movement, such as bending, extending, and rotating the hips and knees. The muscles also enable the legs to move inward toward each other and allow for flexion and rotation of the thighs at the hip joints. These muscles are prone to injury, especially in athletes, as activities like running, jumping, and changing directions can put a lot of strain on them.
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What You'll Learn
Iliopsoas muscles
The iliopsoas muscle is a large muscle in the thigh that is responsible for flexing and rotating the thigh at the hip joint. It is made up of three muscles: the iliacus, psoas major, and psoas minor. These muscles originate from the lumbar vertebrae and the iliac fossa of the pelvis and insert together onto the lesser trochanter of the femur.
The iliopsoas muscle is a crucial hip flexor and assists in external rotation of the hip joint, playing an important role in maintaining the strength and integrity of the hip joint. It is also essential for correct standing or sitting lumbar posture and stabilising the coxofemoral joint. The iliopsoas muscle is the prime mover of hip flexion and is the strongest of the hip flexors.
The iliopsoas muscle is a typical posture muscle, dominated by slow-twitch red type 1 fibres. It gets its innervation from the L2-4 nerve roots of the lumbar plexus, which also send branches to the superficial lumbar muscles. The femoral nerve passes through the muscle and innervates the quadriceps, pectineus, and sartorius muscles.
The iliopsoas muscle is also associated with several disorders, such as tendinopathy, impingement, and bursitis, which can cause chronic groin pain and limited hip range of motion. It is a common site of bleeding in patients undergoing blood anticoagulation.
The iliopsoas muscle has many anatomical relationships through the fascial system surrounding it. Superiorly, the fascia merges with the chest fascia, and posteriorly with the arcuate ligament of the diaphragm muscle. Anteriorly, it merges with the fascia covering the kidneys, pancreas, and other abdominal organs. These connections relate the iliopsoas muscle to different viscera and muscle areas.
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Hamstrings
The hamstrings are skeletal muscles at the back of the thigh, comprising three muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles are responsible for flexing the knee and extending the hip, enabling movements such as walking, climbing stairs, and squatting.
The biceps femoris is located 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 semitendinosus and semimembranosus muscles, on the other hand, are responsible for flexing the knee, extending the hip, and rotating the hip and lower leg. The semimembranosus muscle is located on the innermost side of the back of the thigh.
Hamstring muscles contain thousands of long, elastic muscle fibres that contract and tighten, allowing for various leg movements. However, they are susceptible to injuries, especially among athletes who run and sprint. A sudden change in direction or speed can strain the hamstrings, leading to common injuries like a ""pulled hamstring" or strain. Hamstring injuries can range from mild strains to complete tears, with varying levels of pain, swelling, and impairment of leg function.
To prevent hamstring injuries, it is important to incorporate stretching and warming-up exercises into one's routine and to listen to one's body and not push through pain in the hip, knee, and leg. Hamstring injuries are common, but with proper care and awareness, many injuries can be avoided.
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Adductors
Adduction is not to be confused with "abduction", which is the opposite action of moving the legs away from the body's midline. The adductors are important for providing lower body stability and mobility during daily activities such as walking, climbing stairs, and squatting. They are also crucial for athletes, helping to generate powerful movements such as running, jumping, and quickly moving from side to side.
The adductors originate from various points on the pubic bone and insert onto different locations on the femur, or thigh bone. This unique origin and insertion allow the adductors to pull the legs towards the centre of the body, maintaining balance and stability during movement.
Adductor muscles can be prone to injury, especially in athletes. Strains or tears in the adductor longus, for example, can cause difficulty walking, pain during leg extension, and seated discomfort. Therefore, it is important to include exercises that target the adductors to improve athletic performance and reduce the risk of injury. Toning, strengthening, and stretching the adductors can help athletes prepare for the demands of physical exercise and maintain mobility as they age.
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Quadriceps
The rectus femoris is a biarticular muscle that arises from the anterior inferior iliac spine and the superior edge of the acetabulum. It is the only muscle of the quadriceps group to cross both the hip and knee joints. This muscle can flex the hip and extend the knee. The rectus femoris is crucial for walking and running, as it swings the leg forward into the next step. It also plays an important role in stabilising the patella and the knee joint during gait.
The vastus lateralis originates from the lateral face of the great trochanter, the gluteal tuberosity, and the lateral lip of the linea aspera. The vastus medialis runs from the anatomical neck of the femur and the medial lip of the linea aspera. These muscles work together with the rectus femoris to extend the knee. The vastus intermedius originates at the proximal femur and inserts at the base of the patella.
The five muscles of the quadriceps femoris have heads that merge into a single tendon, the quadriceps tendon, which attaches to the kneecap (patella). The quadriceps are powerful extensors of the knee joint and are essential for daily activities such as climbing stairs or getting up from a chair. They are also important for sports activities such as running, jumping, and squatting.
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Pectineus
The pectineus is a flat, quadrangular-shaped muscle located in the superomedial part of the anterior thigh. It is considered a transitional muscle between the anterior thigh and the medial thigh. The muscle contributes to the floor of the femoral triangle.
The pectineus muscle is the most anterior adductor of the hip. It arises from the pectineal line of the pubis bone and inserts onto the pectineal line on the posterior aspect of the femur, just below the lesser trochanter. The muscle's primary function is hip flexion, but it also produces adduction and external rotation of the hip.
The pectineus muscle is innervated by the femoral nerve (L2 and L3) and, in some cases, a branch of the obturator nerve called the accessory obturator nerve. The femoral nerve is the greater nerve, providing the sole innervation for the muscle in over 90% of cases.
The pectineus muscle can become injured through overstretching, rapid movements like kicking or sprinting, or even by sitting with legs crossed for too long. Treatment of a pectineus muscle injury involves protecting the injured area, minimizing activities that use the muscle, and icing the injury to reduce swelling and pain.
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Frequently asked questions
The iliopsoas, pectineus, sartorius, and quadriceps femoris muscles all flex the thigh at the hip joint.
The iliopsoas group of muscles is made up of the iliacus, psoas major, and psoas minor. They are the main flexors of the thigh.
The pectineus is a flat, quadrangular-shaped muscle that contributes to the floor of the femoral triangle. It is considered a transitional muscle between the anterior and medial thigh.
The sartorius is the longest muscle in the human body. It is long and thin, running across the thigh in an inferomedial direction.
The quadriceps femoris is a group of four muscles: the three vastus muscles (vastus medialis, vastus lateralis, and vastus intermedius) and the rectus femoris. It forms the main bulk of the anterior thigh and is one of the most powerful muscles in the body.
