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The sartorius muscle is the longest muscle in the human body. It is a long, thin muscle that runs down the length of the thigh in the anterior compartment. The muscle originates from the anterior superior iliac spine and crosses to the medial side of the thigh, inserting into the tibia. The sartorius muscle is innervated by the femoral nerve and plays a role in moving the hip and knee joints. Its function includes flexion, abduction, and rotation of the hip and flexion and rotation of the leg.
| Characteristics | Values |
|---|---|
| Muscle length | The longest muscle in the human body |
| Muscle type | Thin, long, superficial |
| Muscle origin | Anterior superior iliac spine |
| Muscle insertion | Medial side of the proximal tibia |
| Muscle course | Oblique, crossing from lateral to medial side of the thigh |
| Muscle function | Flexion, abduction, external rotation of the thigh; flexion and internal rotation of the leg |
| Innervation | Femoral nerve (L2, L3, L4 nerve roots) |
| Blood supply | Femoral artery and its branches, lateral circumflex femoral artery, descending genicular artery, and others |
| Conditions | Pes anserine bursitis (inflammation of the pes anserine bursa) |
| Etymology | Derived from the Latin word "sartor" meaning tailor, referring to the cross-legged position associated with the profession |
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What You'll Learn
The sartorius muscle is the longest muscle in the human body
The sartorius muscle is innervated by the femoral nerve and receives its blood supply from several sources, including the femoral artery and its branches. Its name is derived from the Latin word "sartor," meaning patcher or tailor, as the muscle's function allows an individual to sit in a cross-legged position, similar to how tailors once sat. The muscle may also have been named for its resemblance to a tailor's ribbon. The sartorius muscle can move both the hip and knee joints, allowing for flexion, abduction, and external rotation of the thigh, as well as flexion and internal rotation of the leg.
One of the conditions that can affect the sartorius muscle is pes anserine bursitis, an inflammatory condition of the medial portion of the knee. This condition is common in athletes due to overuse and is characterised by pain, swelling, and tenderness. Young athletes are also susceptible to ASIS avulsion injuries, which can occur during sprinting or swinging a bat. These injuries are caused by a sudden, forceful contraction of the sartorius muscle.
The sartorius muscle is a unique muscle in the human body due to its length and function. Its extensive vascular supply and ability to produce movements in both the hip and knee joints make it an important muscle for activities such as climbing and stabilising the pelvis.
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It is innervated by the femoral nerve
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 anterior inferior iliac spine. It runs obliquely across the upper and anterior part of the thigh in an inferomedial direction.
The sartorius muscle is innervated by the femoral nerve, which receives its nerve supply from L2, L3, and L4 nerve roots. The femoral nerve innervates both the hip flexor and quadriceps muscle groups. The femoral nerve (motor divisions and branches) innervates the following muscles. The innervation to sartorius is derived explicitly from the anterior division of the femoral nerve. The posterior division supplies innervation to the muscles of the quadriceps.
The femoral nerve also supplies sensation to the anterior thigh and medial leg. The blood supply to the sartorius is mainly from the muscular branches of the femoral artery. Over half of the blood supply comes from these muscular branches of the femoral artery, but collateral flow does come from elsewhere. A study researching blood flow to the sartorius demonstrated collateral blood flow arising from the superficial circumflex iliac artery, lateral circumflex femoral artery, superficial femoral artery, descending genicular artery, and superior medial genicular artery.
Deep to the sartorius and its fascia is the adductor canal, through which the saphenous nerve, femoral artery and vein, and nerve to vastus medialis pass.
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It is susceptible to ASIS avulsion injuries
The sartorius muscle is a long, thin muscle in the front of the thigh that runs from the hip to the knee. It is the longest muscle in the human body and is part of the quadriceps group. Originating from the anterior superior iliac spine (ASIS), a bony protrusion on the upper pelvis, the sartorius muscle inserts into the tibia, the larger of the two lower leg bones, just below the knee joint. Due to its attachment to the ASIS, the sartorius muscle is indeed susceptible to ASIS avulsion injuries, where the muscle pulls away from its attachment point. This type of injury can occur when the muscle is subjected to a forceful contraction or sudden stretch, such as during explosive movements or changes in direction. Athletes in sports requiring sudden accelerations, jumping, or quick directional changes, such as sprinting, football, or basketball, are particularly at risk for this type of injury. ASIS avulsion injuries can range from minor strains to complete ruptures of the sartorius muscle. Symptoms may include sudden and intense pain in the hip or thigh, a popping or snapping sensation, bruising, swelling, and difficulty bearing weight or moving the leg. Incomplete tears may heal with conservative management, including rest, ice, compression, elevation, and physical therapy. However, complete ruptures often require surgical intervention for optimal recovery. To prevent ASIS avulsion injuries of the sartorius muscle, it is important to incorporate proper warm-up and cool-down routines in any physical activity, focusing on gradual stretching and strengthening exercises for the hip and thigh muscles. Maintaining adequate flexibility and strength in the lower body can help reduce the risk of such injuries.
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It is involved in hip and knee flexion
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 is involved in hip and knee flexion.
At the hip, the sartorius muscle can flex, weakly abduct, and externally rotate the femur. It works in conjunction with the tensor fasciae latae during hip rotation and abduction. It also acts as a synergist in hip abduction with the gluteus medius and maximus, psoas, piriformis, and quadratus lumborum of the lower back. During lateral rotation of the hip, the sartorius is a synergist to the gluteus maximus, obturator internus and externus, gemelli, quadratus femoris, and the piriformis.
At the knee, the sartorius muscle can flex the leg. When the knee is flexed, the sartorius medially rotates the leg. It assists the hamstring complex (semitendinosus, semimembranosus, and biceps femoris) during knee flexion. The sartorius muscle is involved in synergistic movements that allow the leg to be moved into a figure-4 position, similar to how a tailor would sit with their legs crossed.
The name "sartorius" comes from the Latin word "sartor," meaning tailor, and it is sometimes referred to as the tailor's muscle. This name likely refers to the cross-legged position that tailors once sat in, requiring a combination of lateral rotation and flexion of the hip and flexion of the knee.
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It is associated with pes anserine bursitis
The sartorius muscle is the longest muscle in the human body. It is a long, thin muscle that runs down the length of the thigh in the anterior compartment. It is innervated by the femoral nerve and receives blood supply from the femoral artery. The muscle can move the hip and knee joints, allowing for flexion, abduction, and rotation of the thigh and leg.
Pes anserine bursitis is an inflammatory condition that affects the medial portion of the knee. It occurs when the bursa, a fluid-filled sac that reduces friction between tissues and cushions bones, tendons, and muscles, becomes inflamed. Pes anserine bursitis is associated with the sartorius muscle because it involves inflammation of the bursa located between the muscular tendons of the sartorius, gracilis, and semitendinosus muscles as they insert onto the anteromedial proximal tibia. This condition is often seen in athletes, particularly those who overuse their knees in endurance sports such as cycling or running.
The sartorius, gracilis, and semitendinosus muscles come together to form the pes anserinus, which means "goose's foot" in Latin due to the three-pronged manner in which the tendons insert onto the tibia. When the bursa underlying these tendons becomes inflamed, it can lead to pain, swelling, and tenderness in the inner aspect of the knee. This condition can be treated with rest, cooling, pain medication, and local corticoid injections if necessary. However, if left untreated or poorly treated, pes anserine bursitis can become chronic.
Pes anserine bursitis is also prevalent among obese, middle-aged women, especially those with knee osteoarthritis. This is because women have a wider pelvis, which leads to increased pressure in the area of insertion of the pes anserinus. Flat feet can also contribute to this condition by causing more pressure on the medial knee. Treatment for pes anserine bursitis includes strengthening exercises for the quadriceps and hamstrings, as well as closed-kinetic chain exercises such as squats and leg presses. Ultrasound has also been found to be effective in reducing inflammation associated with this condition.
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Frequently asked questions
The sartorius muscle is located in the thigh. It is the longest muscle in the human body.
The sartorius muscle has long parallel fibres that form a thin, flat muscle. It has an oblique course throughout the thigh.
The sartorius muscle can move the hip joint and the knee joint. It can flex, abduct, and externally rotate the thigh, and flex and internally rotate the leg.
