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The quadriceps femoris muscle, commonly known as the quad muscle, is a group of four muscles located at the front of the thigh. They are some of the largest and strongest muscles in the body. The quad muscles allow a person to stand, walk, run, squat, and jump. The hamstring muscles, located at the back of the thigh, oppose the quadriceps. When one muscle group contracts, the other relaxes, allowing for flexion and extension of the knee.
| Characteristics | Values |
|---|---|
| Name | Hamstring muscles |
| Location | Back of the thigh |
| Function | When the hamstring contracts, the knee joint flexes or bends; when the quadriceps contract, it extends or straightens the leg |
| Common Injuries | Strains, tears, contusions, bruises, tendonitis, ruptures |
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What You'll Learn
The hamstring muscles
The three muscles that make up the hamstring are the biceps femoris, semitendinosus, and semimembranosus. The biceps femoris is a two-headed muscle that originates from the ischial tuberosity of the hip bone and attaches to the head of the fibula bone in the leg. The semitendinosus muscle is a long, thin muscle that originates from the ischial tuberosity and attaches to the medial condyle of the tibia bone in the leg. The semimembranosus muscle is a flat, thin muscle that originates from the ischial tuberosity and attaches to the medial condyle of the tibia.
These three muscles work together to flex the knee joint and extend the hip joint. They are responsible for movements such as bending the knee and straightening the hip, which are essential for activities like running, jumping, and kicking. Similar to the quadriceps, the hamstring muscles are prone to injuries due to their frequent use and the stress they endure. Strains and tears in the hamstring muscles are common, and they can be extremely painful and debilitating.
To reduce the risk of injury, it is essential to warm up and stretch the hamstring muscles before engaging in physical activity. Rest and recovery are also important to prevent overuse and trauma to the hamstrings. Maintaining strong and flexible hamstring muscles helps to ensure stability, balance, and overall lower body health.
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The rectus femoris muscle
The rectus femoris is unique among the quadriceps in that it crosses both the hip and knee joints. It is responsible for flexing the thigh at the hip joint and extending the leg at the knee joint. This muscle arises from two tendons: the anterior or straight tendon, which originates from the anterior inferior iliac spine, and the posterior or reflected tendon, which arises from a groove above the rim of the acetabulum. The two tendons unite at an acute angle, forming an aponeurosis that extends down the anterior surface of the muscle, with muscular fibres arising from it.
The rectus femoris is the strongest extensor of the knee among the quadriceps muscles. However, it is not dominant in knee extension when the hip is flexed due to its shortened length, resulting in active insufficiency. In contrast, the muscle's ability to flex the hip and extend the knee can be compromised in a position of full hip extension and knee flexion due to passive insufficiency. The rectus femoris is a direct antagonist to the hamstrings at both the hip and the knee.
Injury to the rectus femoris tendon can result in an avulsion fracture, where a fragment of the anterior inferior iliac spine of the hip is pulled away due to forceful muscle contraction. This type of injury is uncommon but can occur in young athletes. Strains or tears in the rectus femoris tendon or muscle are also possible, typically caused by forceful movements associated with sprinting, jumping, or kicking. These injuries are common in sports such as football or soccer.
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The vastus medialis muscle
The vastus medialis (vastus internus or teardrop muscle) is an extensor muscle located in the middle of the thigh that extends the knee. It is part of the quadriceps muscle group, which is a group of leg muscles at the front of the thigh. The other muscles in the quadriceps group are the vastus lateralis, vastus intermedius, and rectus femoris. The vastus medialis is the most medial of the "vastus" group of muscles.
The vastus medialis originates from the upper part of the femoral shaft, along the entire length of the femur, and attaches with the other muscles of the quadriceps in the quadriceps tendon. The muscle fibres converge onto the inner (medial) part of the quadriceps tendon and the inner (medial) border of the patella. The patella is then attached to the tibial tuberosity by the patellar ligament. The vastus medialis is involved in knee extension, along with the other muscles that make up the quadriceps muscle. It also has a secondary function of stabilising the patella and contributing to its correct tracking.
The vastus medialis is an important muscle for sports that involve running, jumping, and kicking. However, it is also prone to injuries such as strains, tears, and contusions. Knee joint pain (patellofemoral pain syndrome) has been associated with the vastus medialis, particularly with the misfiring and fatiguing of the muscle, which can lead to mal-tracking of the patella and subsequent damage to surrounding structures.
The obliquus genus muscle is the most distal segment of the vastus medialis muscle. Its specific training is important for maintaining patella position and reducing the risk of injuries to the knee. A division of the vastus medialis muscle into two groups of fibres has been hypothesised: the vastus medialis longus, which is a long and relatively inline group of fibres with the quadriceps ligament; and the vastus medialis obliquus, which is a shorter and more obliquely oriented group of fibres.
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The vastus intermedius muscle
The vastus intermedius is the most recently discovered quad muscle. It is a slanted muscle that sits between the vastus lateralis and vastus medialis muscles. The vastus intermedius is difficult to palpate and stretch, especially once maximum knee flexion is attained. It cannot be further stretched by hip extension as the rectus femoris can, nor is it accessible for massage therapy to stretch the fibres sideways as the vastus lateralis and vastus medialis are.
The vastus intermedius is one of the muscles that help to extend the knee. The quadriceps femoris muscle group is essential for daily activities such as climbing stairs, getting up from a chair, and walking. It is also important for sports, being heavily involved in kicking, jumping, cycling, and running.
The quadriceps femoris muscle group is prone to injuries such as strains, tears, and contusions, which can result in lost training and competition time for athletes. These injuries can be caused by repetitive strain, trauma, or direct blows to the front of the thigh. Myositis ossificans is a complication associated with severe quadriceps contusions, involving the proliferation of bone and cartilage in the area of the injury.
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The vastus lateralis muscle
The vastus lateralis functions as a primary extender of the knee, working with the other muscles of the quadriceps to extend the knee joint and move the lower leg forward. It also helps to stabilize the knee joint, particularly when working in conjunction with the vastus medialis. The vastus lateralis is the recommended injection site for intramuscular injections in infants under seven months old and those unable to walk due to a loss of muscular tone.
Some evidence suggests that in patients with patellofemoral pain syndrome, the vastus lateralis contracts prematurely compared to the vastus medialis, which may contribute to knee pain. However, recent studies have not clinically proven this theory, and vastus lateralis/medialis timing has been shown to be uneven in healthy individuals as well. The vastus lateralis may have two insertional heads, referred to as the vastus lateralis long head (VLL) and the vastus lateralis obliquus (VLO), in approximately 60% of specimens.
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Frequently asked questions
The hamstring muscles oppose the quadriceps. When the hamstring contracts, the knee joint flexes or bends, and when the quadriceps contract, the leg is extended or straightened.
The quadriceps, or quads, are a group of four muscles located at the front of the thigh. They are some of the body's largest and strongest muscles.
The quadriceps allow a person to stand, walk, run, squat, and jump. They are active in jumping, running, and kicking movements.
The quadriceps are used in many different types of movement and physical activities, so they are prone to injury from overuse, overstretching, or trauma. Common injuries include strains, tears, tendonitis, and contusions.
