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The sartorius muscle, or the tailor's 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 several conditions that can limit functional mobility, such as sartorius tendonitis and sartorius tear, which cause pain and limited mobility of the muscle. The name sartorius comes from the Latin word sartor, meaning tailor. This is likely in reference to the cross-legged position in which tailors once sat, with one leg crossed over the other, ankle on top of the knee.
| Characteristics | Values |
|---|---|
| Pronunciation | /sɑːrˈtɔːriəs/ |
| Alternative names | Tailor's muscle, couturier |
| Etymology | From the Latin word "sartor", meaning patcher or tailor |
| Appearance | Long, thin, superficial |
| Length | Often exceeds 50cm |
| Muscle fibres | 30–50% run from tendon to tendon |
| Fibre length | 35–45cm |
| Shape | S-shaped |
| Joints crossed | Hip and knee |
| Function | Flexion, external rotation and abduction of the leg |
| Innervation | Femoral nerve |
| Blood supply | 5–11 vessels from the circumflex iliac, lateral femoral, deep femoral, descending geniculate, and femoral arteries |
| Conditions | Pes anserine bursitis |
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What You'll Learn
The sartorius muscle is the longest muscle in the human body
The sartorius muscle is pronounced as /sɑːrˈtɔːriəs/. It is the longest muscle in the human body, often exceeding 50 cm in length. It is a long, thin, and superficial muscle that runs down the length of the thigh in the anterior compartment. The sartorius muscle is innervated by the femoral nerve and plays a crucial role in pelvis stabilization, especially in women.
The sartorius muscle originates from the anterior superior iliac spine and the upper half 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, ending in a tendon that curves anteriorly to join the tendons of the gracilis and semitendinosus muscles in the pes anserinus. This tendon then inserts into the superomedial surface of the tibia. The upper portion of the sartorius muscle forms the lateral border of the femoral triangle, an important anatomical space.
The sartorius muscle is superficial, with only fascia and skin covering it. It crosses from the lateral to the medial side of the thigh, overlapping with other muscles such as the iliopsoas, pectineus, and adductor longus. The tensor fasciae latae muscle originates just lateral to the sartorius muscle's proximal attachment. The sartorius muscle's length and position allow it to move both the hip and knee joints, although its actions are considered weak.
The name "sartorius" derives from the Latin word "sartor," meaning tailor. It is sometimes referred to as the "tailor's muscle" because tailors traditionally sat in a cross-legged position, which demonstrates all four actions of the sartorius muscle. Additionally, the inferior portion of the muscle is located in the "inseam" area of the inner thigh, which tailors commonly measure when fitting trousers.
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It is also known as the 'tailor's muscle'
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 known as the tailor's muscle. This name likely refers to the cross-legged position in which tailors once sat. The word "sartorius" comes from the Latin word "sartor", which means "tailor". In French, an older name for this muscle is "couturier" (seamstress or dressmaker), with a similar reference to s'asseoir en tailleur ("sitting as a tailor" in French).
There are several 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. Antique sewing machines required continuous cross-body pedalling, which resulted in tailors having particularly developed sartorius muscles due to the combination of lateral rotation and flexion of the hip and flexion of the knee.
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. It passes behind the medial condyle of the femur to end 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. Its upper portion forms the lateral border of the femoral triangle, and the point where it crosses the adductor longus marks the apex of the triangle.
The sartorius muscle can move the hip joint and the knee joint, but 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. Sitting cross-legged demonstrates all four actions of the sartorius.
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It is a long, thin, superficial muscle
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 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 well-developed sartorius muscles.
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. It passes behind the medial condyle of the femur to end 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 pes anserinus is latin for "Goose's Foot". It refers to the conjoined tendons of the gracilis, semitendinosus, and sartorius muscles. These tendons attach onto the anteromedial proximal tibia. The sartorius muscle lies superficially in the thigh, with only fascia and skin over its surface. Deep to the sartorius is the quadriceps femoris muscle.
The sartorius 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. The contraction of the sartorius can also cause flexion of the knee joint and inward, or medial, rotation of the tibia against the femur. The combination of all these movements allows an individual to sit in a cross-legged position.
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The sartorius muscle crosses the hip and knee joints
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 name sartorius comes from the Latin word "sartor", meaning tailor, and it is sometimes called the
The sartorius 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. The contraction of the sartorius can also cause flexion of the knee joint and inward, or medial, rotation of the tibia against the femur. The combination of all these movements allows an individual to sit in a cross-legged position. However, the movements created by the contraction of the sartorius are not limited to this single function. It is also suggested that the sartorius may play an important role in climbing.
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. It passes behind the medial condyle of the femur to end 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. Its upper portion forms the lateral border of the femoral triangle, and the point where it crosses the adductor longus marks the apex of the triangle.
The sartorius muscle lies superficially in the thigh, with only fascia and skin over its surface. Deep to the sartorius is the quadriceps femoris muscle. As it crosses from the lateral to the medial side of the thigh, the sartorius muscle crosses the surfaces of the iliopsoas, pectineus, and adductor longus muscles. The tensor fasciae latae muscle originates just lateral to the proximal attachment of the sartorius muscle. The medial edge of the sartorius forms the lateral border of an important anatomical space known as the femoral triangle.
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It is involved in several conditions that may limit functional mobility
The sartorius muscle is a long, thin muscle that runs from the pelvis down to the knee, crossing the hip and knee joints. It is the longest muscle in the human body. As it is involved in the stabilisation of the pelvis, the rotation of the thigh, and the flexion of the knee, injuries to the sartorius muscle can cause pain, swelling, and weakness, limiting functional mobility.
Sartorius muscle injuries may occur in conjunction with injuries to other thigh muscles, such as the psoas or the quadriceps. This is due to the interconnected role these muscles play in moving the thigh and knee.
One condition that may affect the sartorius muscle is pes anserine tendonitis, which causes pain in the upper shin bone below the knee. This condition can be treated with therapy to decrease pain and inflammation and improve sartorius flexibility and strength.
Another condition that may affect the sartorius muscle is myofascial pain syndrome, which can develop from overuse or injury of the muscle. This condition can cause chronic pain and affect mobility. Treatment for myofascial pain syndrome may include chiropractic care, patient-focused diet plans, and mobility-agility training.
Additionally, nerve compression in the lower back due to a herniated disc or spinal foraminal stenosis can lead to weakness and pain in the front of the thigh, impacting the sartorius muscle. Treatment for this condition may include exercises to relieve nerve compression and correct posture.
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Frequently asked questions
The sartorius muscle is pronounced /sɑːrˈtɔːriəs/.
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 the hip and knee joints.
The sartorius muscle helps to rotate the leg into a cross-legged position and flexes and rotates the hip and knee joints.
