Logan Steele
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 name sartorius comes from the Latin word sartor, meaning patcher or tailor, referring to the cross-legged position in which tailors once sat. The muscle is innervated by the femoral nerve and plays an important role in stabilising the pelvis, especially in women. The sartorius muscle can be absent in some people, and its exceptional length often exceeds 50 cm.
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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 vascular supply from several sources, including the femoral, deep femoral, and lateral circumflex femoral arteries. It can move 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. However, its actions are considered weak, making it a synergist muscle.
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 in which tailors once sat, requiring a combination of lateral rotation and flexion of the hip and flexion of the knee. Antique sewing machines also required continuous crossbody pedaling, which would have contributed to the development of the sartorius muscle in tailors.
The sartorius muscle plays an important role in pelvis stabilisation, especially in women, due to the constrictive effect it has on the pubic symphysis. It is also associated with the pes anserinus, which involves the tendons of the gracilis, semitendinosus, and sartorius muscles attaching to the anteromedial proximal tibia. One condition that can affect the sartorius is pes anserine bursitis, an inflammatory condition of the medial portion of the knee that is common in athletes due to overuse.
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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 is innervated by the femoral nerve. The femoral nerve receives its nerve supply from L2, L3, and L4 nerve roots. The femoral nerve innervates both the hip flexor and quadriceps muscle groups. The pectineus nerve, which branches off the femoral nerve cephalad to the inguinal ligament, innervates the pectineus.
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 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. The sartorius muscle plays an important role in pelvis stabilization, especially in women, due to the constrictive effect of the muscles on both sides of the body on the pubic symphysis.
The blood supply to the sartorius comes primarily from the muscular branches of the femoral artery. Over half of the blood supply comes from these muscular branches, but collateral flow also arises from other sources, including the superficial circumflex iliac artery, lateral circumflex femoral artery, superficial femoral artery, descending genicular artery, and superior medial genicular artery.
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It is a hip and knee flexor
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, which joins the tendons of the gracilis and semitendinosus muscles in the pes anserinus. This muscle is also known as the "tailor's muscle" or "couturier" (in French), as the name likely refers to the cross-legged position in which tailors once sat.
The sartorius muscle is a hip and knee flexor. At the hip, it can flex, weakly abduct, and laterally rotate the femur. This means that it can bend the hip joint, move the leg away from the body, and rotate the leg outward. At the knee, it can flex the leg and medially rotate it; that is, it can bend the knee joint and rotate the leg inward. The combination of these movements allows an individual to sit in a cross-legged position.
The sartorius muscle is innervated by the femoral nerve and receives 5 to 11 vessels originating from various arteries, including the superficial circumflex iliac, lateral femoral, deep femoral, descending geniculate, and femoral arteries. The muscle may be absent in some people, and it plays an important role in stabilising the pelvis, especially in women.
The sartorius muscle is involved in various movements and functions of the hip and knee joints. Its ability to flex the hip and knee joints allows for a wide range of motions, such as sitting cross-legged or climbing. The muscle also contributes to the medial stability of the knee joint, with some fibres from the inferior part of the tendon blending with the medial collateral ligament of the knee joint.
The sartorius muscle is an important muscle in the human body, allowing for various movements and providing stability to the pelvis and lower body. Its length and position in the anterior compartment of the thigh enable it to influence both the hip and knee joints, making it a crucial muscle for maintaining balance and flexibility in the lower body.
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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 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. This name likely refers to the cross-legged position in which tailors once sat. In French, an older name for this muscle is "couturier" (seamstress or dressmaker), with a similar reference to "sitting as a tailor". 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 closely resembles a tailor's ribbon. Antique sewing machines required continuous cross-body pedalling, which would have given tailors particularly developed sartorius muscles.
The sartorius muscle can move the hip joint and the knee joint. 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. The muscle may be absent in some people.
The sartorius muscle is supplied by the femoral nerve. It receives 5 to 11 vessels originating from the superficial circumflex iliac, lateral femoral, deep femoral, descending geniculate, and femoral arteries. It plays an important part 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.
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It is susceptible to ASIS avulsion injuries
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 is particularly susceptible to anterior superior iliac spine (ASIS) avulsion injuries, which are a type of stable fracture. This is because the anterior superior iliac spine is the site of origin and attachment for the sartorius muscle.
ASIS avulsion injuries typically occur during forceful muscular contraction, especially in athletes or adolescents performing vigorous physical activity. Sports that require sudden powerful muscular contractions and abrupt directional changes, such as sprinting, football, and gymnastics, carry a higher risk of this type of injury. The injury can occur when the musculotendinous unit is suddenly and vigorously contracted, resulting in a fracture as the weaker cartilaginous growth plate is unable to withstand the force.
The symptoms of an ASIS avulsion injury include pain, swelling, and tenderness. Treatment is usually conservative and outpatient-based, involving the use of crutches, analgesics, and modified activity. Spontaneous recovery typically occurs within 4 to 6 weeks. However, in cases with significant displacement or the presence of painful fragments, surgical intervention may be necessary.
It is important to distinguish ASIS avulsion injuries from bone tumours, as they can present with similar symptoms and imaging findings. A thorough clinical examination, including radiographs, MRI scans, or computed tomography (CT) scans, can aid in making an accurate diagnosis and determining the appropriate treatment approach.
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Frequently asked questions
The sartorius muscle is the longest muscle in the human body. It is a thin, long, superficial muscle that runs down the length of the thigh, crossing the hip and knee joints.
The sartorius is a flexor of the hip and knee joints. It also balances the hip bone on the femur and plays a role in pelvis stabilisation.
The name is derived from the Latin word 'sartor', meaning patcher or tailor. This is due to the cross-legged position tailors would sit in, which demonstrates all four actions of the sartorius muscle.
One condition that can affect the sartorius is pes anserine bursitis, an inflammatory condition of the medial portion of the knee. This is often seen in athletes due to overuse and is characterised by pain, swelling and tenderness.
