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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, crossing both the hip and knee joints. It is innervated by the femoral nerve and supplied by various arteries. The sartorius muscle helps with bending the knees and hips and rotating the leg outward, and it is sometimes referred to as the tailor's muscle. This muscle can be the cause of pain, swelling, and tenderness in the knee or the front of the hip, and certain exercises can help strengthen it and reduce pain. So, is the sartorius muscle considered a quad muscle?
| Characteristics | Values |
|---|---|
| Muscle name | Sartorius muscle |
| Other names | Tailor's muscle, couturier |
| Muscle length | Longest muscle in the human body |
| Muscle width | Adaptive ethnic differences in width |
| Muscle shape | Long, thin, narrow, superficial |
| Muscle origin | Anterior superior iliac spine |
| Muscle insertion | Proximal medial surface of the tibia |
| Muscle course | Oblique, inferomedial direction |
| Muscle function | Flexes, abducts, and externally rotates the thigh, and flexes and internally rotates the leg |
| Muscle innervation | Femoral nerve (L2–L3/L2-4) |
| Muscle blood supply | Superficial circumflex iliac, lateral femoral, deep femoral, descending geniculate, and femoral arteries |
| Muscle pain | Burning sensation in the front of the hip, tenderness on the inside of the knee, swelling, pain, and weakness |
| Muscle treatment | Rest, over-the-counter (OTC) pain medications, ice, exercises, and stretches |
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What You'll Learn
- 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
- The sartorius muscle is innervated by the femoral nerve
- It is also known as the tailor's muscle because it allows people to sit cross-legged
- The muscle assists in flexion of the leg at the knee, hip flexion, abduction and lateral rotation of the thigh
The sartorius muscle is the longest muscle in the human body
The sartorius muscle starts at the front part of the pelvis, known as the anterior superior iliac spine (ASIS), and runs obliquely across the upper and anterior part of the thigh in an inferomedial direction. It then crosses the inner knee and attaches to the front of the shin bone, or tibia. The muscle passes behind the medial condyle of the femur, ending in a tendon that curves anteriorly to join the tendons of the gracilis and semitendinosus muscles in the pes anserine. This is the insertion point for the sartorius, gracilis, and semi-tendinosis muscles of the hamstring, and it is also known as the "goosefoot".
The sartorius muscle is innervated by the femoral nerve, which arises from the lumbar plexus. The muscle receives blood supply, or vascular supply, from several sources, including the femoral, deep femoral, and lateral circumflex femoral arteries. The sartorius muscle can move the hip and knee joints, although its actions are weak, making it a synergist muscle. At the hip, it can flex, weakly abduct, and rotate the thigh laterally. At the knee, it can flex the leg and, when the knee is flexed, it also rotates the leg medially.
The sartorius muscle is prone to injury, with pain occurring in the knee or the front of the hip. This can cause swelling, pain, and weakness in the muscle, limiting mobility. Treatment for sartorius muscle pain includes rest, ice, and over-the-counter pain medications. Certain exercises can also help to strengthen the muscle and reduce pain.
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It is a long, thin, superficial muscle that runs down the length of the thigh
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 also referred to as the "tailor's muscle". This name likely refers to the cross-legged position in which tailors once sat, with one leg crossed over the other, ankle on top of the other knee. Antique sewing machines also required continuous crossbody pedalling, which would have given tailors particularly well-developed sartorius muscles. The muscle can be felt at the front part of the hip near the pelvic bone.
The sartorius muscle starts at the front of the pelvis, at the anterior superior iliac spine, and runs obliquely across the upper and anterior part of the thigh in an inferomedial direction. It passes behind the medial condyle of the femur and ends in a tendon that joins the tendons of the gracilis and semitendinosus muscles in the pes anserinus, inserting into the superomedial surface of the tibia. The pes anserinus means "goosefoot" in Latin and is the insertion point for the three muscles.
The sartorius muscle is innervated by the femoral nerve, which arises from the lumbar plexus. It receives blood supply from various arteries that penetrate the muscle at irregular intervals, including the superficial circumflex iliac, the lateral femoral, and the deep femoral arteries of the thigh. The muscle assists in flexion of the leg at the knee, hip flexion, abduction and lateral rotation of the thigh. It is capable of flexion, external rotation and abduction of the leg, as well as flexion of the knee joint and inward, or medial, rotation of the tibia against the femur.
Sartorius muscle pain can cause swelling, pain, and weakness in the muscle and limit mobility. It can cause a burning sensation down the front of the hip or tenderness on the inside of the knee. Rest and over-the-counter pain medications can help with pain relief. Ice can also be applied to the affected area. Certain exercises can also help strengthen the muscle and reduce pain.
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The sartorius muscle 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, from the pelvis to the knee, and helps to rotate the thigh and flex the knee. The muscle is very long, and it can be touched at the front part of the hip near the pelvic bone. The sartorius is also referred to as the ""tailor's muscle", as its name comes from the Latin word "sartor", meaning tailor. This name is likely in reference to the cross-legged position in which tailors once sat.
The sartorius muscle is a part of the anterior muscles of the thigh. It has an oblique course throughout the thigh, arising from the anterior superior iliac spine, crossing to the medial side of the thigh, and inserting at the medial side of the proximal tibia. The muscle crosses both the hip and knee joints, producing movements in both of them. At the hip joint, it is capable of flexion, external rotation, and abduction of the leg. At the knee, it can flex the leg; when the knee is flexed, it also rotates the leg medially.
The sartorius muscle receives an extensive vascular supply from several sources. The proximal third may receive its vascular supply from the branches of the femoral, deep femoral, lateral circumflex femoral arteries, and/or the artery of quadriceps. The middle third is supplied by branches of the femoral artery, while the distal third receives blood from the femoral artery and descending genicular artery.
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It is also known as the tailor's muscle because it allows people to sit cross-legged
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 runs obliquely across the upper and anterior part of the thigh in an inferomedial direction. It passes behind the medial condyle of the femur and ends in a tendon. This tendon curves anteriorly to join the tendons of the gracilis and semitendinosus muscles in the pes anserinus, where it inserts into the superomedial surface of the tibia.
The sartorius muscle is also known as the "tailor's muscle" because it helps to flex and rotate the hip and flex the knee, allowing people to sit with one leg crossed over the other, with the ankle on top of the other knee. This cross-legged position was often adopted by tailors when sewing seams by hand. The name "sartorius" comes from the Latin word "sartor", meaning tailor. Similarly, in French, an older name for this muscle is "couturier" (seamstress or dressmaker), with a similar reference to "sitting as a tailor" ("s'asseoir en tailleur").
There are other hypotheses as to the origin of the name. One is that it refers to the location of the inferior portion of the muscle being the "inseam", or area of the inner thigh that tailors commonly measure when fitting trousers. Another is that the muscle's appearance closely resembles a tailor's ribbon. Additionally, antique sewing machines required continuous crossbody pedalling. This combination of lateral rotation and flexion of the hip and flexion of the knee gave tailors particularly developed sartorius muscles.
The sartorius muscle plays an important role in stabilising the pelvis, especially in women, due to the constrictive effect of the muscles on both sides of the body on the pubic symphysis. The muscle can move the hip and knee joints, demonstrating flexion, weak abduction, and lateral rotation of the femur at the hip, and flexion and medial rotation of the leg at the knee. Sitting cross-legged demonstrates all four actions of the sartorius.
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The muscle assists in flexion of the leg at the knee, hip flexion, abduction and lateral rotation of the thigh
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, from the pelvis to the knee. It is innervated by the femoral nerve and receives blood supply from various arteries, including the superficial circumflex iliac, lateral femoral, and deep femoral arteries.
The sartorius muscle plays a role in flexion of the leg at the knee. When the knee is flexed, it also helps to rotate the leg medially. This means that it bends the knee and turns the leg inward. This is one of the actions that make the sartorius unique, as it moves the hips and knees in various directions.
Additionally, the sartorius assists in hip flexion, which means it bends the hip upward, similar to a marching motion. It also aids in abduction of the thigh at the hip, which involves moving the thigh laterally away from the pelvis. This is produced by muscles such as the gluteus medius, gluteus minimus, and sartorius.
The sartorius further contributes to the lateral rotation of the thigh at the hip. This involves rotating the thigh outward from the body. The sartorius, along with other muscles like the gluteus medius and biceps femoris, facilitates this movement.
Overall, the sartorius muscle is involved in several important functions, including flexion of the leg at the knee, hip flexion, abduction of the thigh, and lateral rotation of the thigh. Its exceptional length and ability to cross two joints—the hip and the knee—enable it to provide a wide range of motions and stability to the lower body.
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Frequently asked questions
Yes, the sartorius is the longest muscle in the human body and is one of the anterior muscles of the thigh.
The sartorius muscle runs down the length of the thigh, from the front of the pelvis (anterior superior iliac spine) to the knee.
The sartorius muscle helps to flex and rotate the hip and flex the knee. It is also involved in rotating the knees inward and bending the knees.
Some issues associated with the sartorius muscle include pain, swelling, and tenderness, which can be caused by conditions such as pes anserine bursitis, an inflammatory condition of the medial portion of the knee.
