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The quadriceps femoris muscle, commonly known as the quad muscle, is the strongest muscle in the human body. Located in the anterior compartment of the thigh, the quadriceps is made up of four individual muscles: the rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius. These muscles work together to help with movements such as kicking, running, jumping, and walking. They are also essential for everyday activities like climbing stairs and getting up from a chair. The quadriceps are prone to injuries such as strains, tears, and contusions, which can be painful and debilitating.
| Characteristics | Values |
|---|---|
| Number of muscles | 4 |
| Muscle names | Rectus femoris, vastus medialis, vastus lateralis, vastus intermedius |
| Muscle functions | Extension of the knee joint, flexion of the hip joint, stabilising the patella, stabilising joints, balancing |
| Muscle actions | Kicking, running, jumping, walking, lunging, squatting, climbing stairs, standing |
| Muscle innervation | Femoral nerve |
| Muscle blood supply | Femoral artery, deep femoral artery, descending genicular artery |
| Muscle location | Front of the thigh |
| Muscle morphology | Striped appearance due to red and white muscle fibres |
| Muscle injuries | Strains, tears, contusions, tendonitis, ruptures |
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Rectus femoris
The rectus femoris is one of the four muscles that make up the quadriceps femoris, or "quad muscle", which is the strongest muscle in the human body. The other three muscles are the vastus medialis, vastus intermedius, and vastus lateralis. The rectus femoris is the only muscle in the quadriceps group that crosses both the hip and knee joints.
The rectus femoris is a fusiform-shaped muscle with superficial bipenniform fibres and deep, vertically oriented fibres. It is situated in the middle of the front of the thigh and is the most superficial and nearly vertically oriented muscle in the anterior thigh compartment. The word ""rectus" means "straight" in Latin, and the rectus femoris gets its name from the fact that it runs straight down the thigh. It is a two-way acting muscle, extending the knee and flexing the thigh at the hip joint. It is a direct antagonist to the hamstrings at the hip and knee.
The rectus femoris is prone to injury because it crosses both the hip and knee joints. Rectus femoris strain, also known as hip flexor strain, is a common injury at the tendon that attaches to the patella or in the muscle itself. This injury is usually caused by a forceful movement related to sprinting, jumping, or kicking and is often seen in sports such as football or soccer. Symptoms of a rectus femoris tear include a sudden sharp pain at the front of the hip or in the groin, swelling and bruising, and an inability to contract the muscle with a full tear.
The rectus femoris is innervated by the femoral nerve, which originates from lumbar nerve roots L2, L3, and L4. Blood is supplied to the rectus femoris via the descending branch of the lateral circumflex femoral (LCF) artery.
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Vastus lateralis
The vastus lateralis is the largest of the four muscles that make up the quadriceps femoris, or simply quadriceps, muscle group. The other three muscles are the rectus femoris, vastus medialis, and vastus intermedius. The quadriceps femoris is the strongest muscle in the human body and is located in the anterior compartment of the thigh. The vastus lateralis is also called the vastus externus.
The vastus lateralis is a unipennate muscle and is part of the intermediate layer of the quadriceps tendon. The muscle fibres converge and contribute to the quadriceps tendon, inserting on the lateral aspect of the patella. The muscle ultimately joins with the other muscles that make up the quadriceps in the quadriceps tendon, which travels over the knee to connect to the tibia.
The vastus lateralis arises from a series of flat, broad tendons attached to the femur, with origin points including the intertrochanteric line, greater trochanter, lateral aspect of the linea aspera, gluteal tuberosity, and the lateral intermuscular septum. The muscle fibres form a large fleshy mass, attached to a second strong aponeurosis, placed on the deep surface of the lower part of the muscle. This lower aponeurosis becomes contracted and thickened into a flat tendon that attaches to the outer border of the patella.
The vastus lateralis is innervated by the muscular branches of the femoral nerve (L2, L3, and L4) and is supplied by the lateral circumflex femoral artery. The lateral circumflex femoral artery has three main branches: ascending, transverse, and descending. The muscle also receives some blood supply from perforating arteries of the deep artery of the thigh, also known as the profunda femoris. Venous drainage of the vastus lateralis is achieved through the perforating veins of the deep femoral vein, the lateral femoral circumflex vein, and other unnamed veins from the superficial venous circulation.
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Vastus medialis
The vastus medialis, also known as the vastus medialis oblique (VMO) or vastus internus, is a teardrop-shaped muscle located in the front of the thigh. It is one of the four muscles that make up the quadriceps, along with 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 several landmarks of the proximal femur, including the inferior part of the intertrochanteric line, the pectineal line of the femur, the medial lip of the linea aspera, and the proximal half of the medial supracondylar line. It descends obliquely through the thigh, with its fibres spiralling around the long axis of the muscle. The lowermost fibres lie in an almost horizontal plane, forming a noticeable bulge superior to the medial side of the patella. This particular part of the vastus medialis is sometimes referred to as the vastus obliquus.
The muscle then inserts into the base of the patella via the quadriceps femoris tendon, with some tendinous fibres continuing downwards and inserting into the medial condyle of the tibia. The vastus medialis is supplied by three muscular branches of the femoral artery and also receives minor contributions from the deep femoral and descending genicular arteries.
The vastus medialis is responsible for extending the knee joint and stabilising the kneecap. It works in tandem with the other quadriceps muscles to extend the knee and keep the kneecap properly aligned. Weakness or injury to the vastus medialis can lead to knee instability, particularly during weight-bearing activities such as running and jumping. It is also associated with patellofemoral pain syndrome (PFPS), which occurs when the cartilage under the kneecap is damaged due to injury or overuse.
To treat a vastus medialis injury, rest, ice application, compression, and elevation of the leg are typically recommended, along with over-the-counter pain relievers. Physical therapy and surgery may be necessary in severe cases. Specific exercises that can help target the vastus medialis include squats, lunges, and step-ups.
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Vastus intermedius
The quadriceps femoris muscle, commonly known as the quad muscle, is the strongest muscle in the human body. It is made up of four individual muscles: the rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius. The vastus intermedius is a new muscle that is part of the quadriceps. It originates from the upper two-thirds of the anterior and lateral surfaces of the femur and the lateral intermuscular septum. The vastus intermedius sits under the rectus femoris muscle, and its fibres end in a superficial aponeurosis, which forms the deep part of the quadriceps femoris tendon. The tendon then inserts into the lateral margin of the patella.
The vastus intermedius muscle is innervated by a branch of the femoral nerve, which originates from lumbar nerve roots L2, L3, and L4. The descending branch of the lateral circumflex femoral artery supplies this muscle. The quadriceps femoris muscle is the only muscle of the quadriceps to cross both the hip and knee joints. It flexes the thigh at the hip joint and extends at the knee joint. The quadriceps femoris muscle is essential for daily activities such as climbing stairs and getting up from a chair. It is also important for sports activities such as jumping, running, and cycling.
The vastus medialis and intermedius appear to be inseparably united. However, when the rectus femoris is reflected during dissection, a narrow interval can be observed extending upward from the medial border of the patella between the two muscles. The vastus intermedius is the deepest and middle-most of the quadriceps muscle group, making it the most difficult to stretch once maximum knee flexion is attained.
The quadriceps muscle group is often subject to trauma due to the stress it receives. Strains, tears, and contusions of the quadriceps are common in various sports, resulting in lost training and competition time. Myositis Ossificans is a complication associated with severe quadriceps contusions, characterised by the proliferation of bone and cartilage in the contusion area.
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Sartorius
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 muscle originates from the anterior superior iliac spine and part of the notch between the anterior superior iliac spine and the anterior inferior iliac spine. It runs obliquely across the upper and anterior part of the thigh in an inferomedial direction.
The sartorius muscle is positioned more superficially than the other muscles in the leg. It is one of the muscles in the anterior compartment of the thigh that is innervated by the femoral nerve. The muscle may be split into two parts, and one part may be inserted into the fascia lata, the femur, the ligament of the patella, or the tendon of the semitendinosus. The tendon of insertion may end in the fascia lata, the capsule of the knee joint, or the fascia of the leg.
The sartorius muscle plays an important role in stabilising the pelvis, especially in women. This is due to the constrictive effect that the muscles on both sides of the body have on the pubic symphysis. The sartorius muscle can move both the hip joint and the knee joint, although its actions are weak, making it a synergist muscle. At the hip, it can flex, weakly abduct, and laterally rotate the femur. At the knee, it can flex the leg; when the knee is flexed, the sartorius medially rotates the leg.
The name 'sartorius' comes from the Latin word 'sartor', meaning 'tailor', and it is sometimes called the tailor's muscle. This name likely refers to the cross-legged position in which tailors once sat. Antique sewing machines required continuous cross-body pedalling, which would have given tailors particularly developed sartorius muscles.
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Frequently asked questions
The four muscles that form the quadriceps are the rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius.
The quadriceps are located at the front of the thigh.
The quadriceps help to extend the leg at the knee joint and to flex the thigh at the hip joint. They are essential for daily activities such as walking, running, jumping, and climbing stairs.
