Logan Steele
The longest muscle in the human body is the sartorius muscle, 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 and can move the hip and knee joints. Its name comes from the Latin word 'sartor', meaning 'tailor', and it is sometimes called the 'tailor's muscle'. This may refer to the cross-legged position in which tailors once sat, or 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.
| Characteristics | Values |
|---|---|
| Name | Sartorius Muscle |
| Location | Thigh |
| Type | Superficial muscle |
| Shape | Long and thin |
| Joints | Hip and knee |
| Innervation | Femoral nerve L2 and L3 |
| Blood vessels | 5 to 11 vessels from the superficial circumflex iliac, lateral femoral, deep femoral, descending geniculate, and femoral arteries |
| Function | Flexion, external rotation, and abduction of the leg at the hip joint; flexion of the knee joint and inward, or medial, rotation of the tibia against the femur |
| Length | Often exceeds 50 cm |
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What You'll Learn
The sartorius muscle is the longest 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, lateral circumflex femoral, and descending genicular arteries. Its name is derived from the Latin word "sartor," meaning tailor, and it is sometimes referred to as the "tailor's muscle." This name may refer to the cross-legged position in which tailors once sat, the location of the muscle in the inner thigh area that tailors measure when fitting trousers, or the resemblance of the muscle to a tailor's ribbon.
The muscle plays a role in the flexion, abduction, and external rotation of the thigh, as well as the flexion and internal rotation of the leg. It is also suggested that the sartorius muscle may be important for climbing and stabilising the pelvis, especially in women.
The sartorius muscle can exceed 50 cm in length, and its exceptional length means that not all muscle fibres run through the entire muscle belly. It is estimated that only 30-50% of the fibres run from tendon to tendon, with the rest ending intrafascicularly. The length of a single fibre is estimated to be around 35-45 cm.
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The sartorius muscle is thin and superficial
The sartorius muscle is the longest muscle in the human body. It is a long, thin, and superficial muscle that runs down the length of the thigh in the anterior compartment. The sartorius muscle is superficial, with only fascia and skin covering its surface. It is situated in the thigh's anterior compartment, running over the hip and knee joints. The muscle is innervated by the femoral nerve and may originate from several locations, including the outer end of the inguinal ligament, the notch of the ilium, the ilio-pectineal line, or the pubis.
The sartorius muscle is a thin muscle that can be split into two parts. 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 can end in the fascia lata, the capsule of the knee joint, or the fascia of the leg. The muscle may be absent in some people, and even when present, its actions are relatively weak, making it a synergist muscle.
The sartorius muscle plays a role in moving both the hip and knee joints. At the hip, it can flex, weakly abduct, and laterally rotate the femur. At the knee, it can flex the leg, and when the knee is flexed, the sartorius medially rotates the leg. Sitting cross-legged demonstrates all four actions of the sartorius muscle. The muscle also helps stabilize the pelvis, especially in women, due to the constrictive effect on the pubic symphysis.
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. Another hypothesis suggests that the name refers to the location of the inferior portion of the muscle, the "inseam" area of the inner thigh that tailors commonly measure when fitting trousers. Antique sewing machines required continuous crossbody pedaling, which would have resulted in tailors having particularly developed sartorius muscles.
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It runs down the length of the thigh
The longest muscle in the human body is the sartorius muscle. 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 passes obliquely across the upper and anterior part of the thigh in an inferomedial direction. It runs over two joints: the hip and knee joints. At the hip, it flexes, abducts, and rotates the thigh laterally; at the knee, it flexes the leg and rotates it medially. This combination of movements allows an individual to sit in a cross-legged position, and it is thought that the muscle's name may refer to this pose, which was once common among tailors.
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 is estimated that the length of a single fibre in the sartorius muscle is between 35 and 45 cm, with the entire muscle often exceeding 50 cm in length.
The sartorius muscle plays an important role in stabilising the pelvis, particularly in women, due to the constrictive effect of the muscles on both sides of the body on the pubic symphysis. It is also suggested that the sartorius may play a role in climbing, as its contraction can produce movements in both the hip and knee joints.
The name "sartorius" comes from the Latin word "sartor," meaning tailor, and it is sometimes referred to as the "tailor's muscle." This name may refer to the cross-legged position in which tailors once sat, or to the location of the inferior portion of the muscle, which is the "inseam" area that tailors commonly measure when fitting trousers. Antique sewing machines required continuous crossbody pedalling, which would have resulted in particularly developed sartorius muscles.
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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 in the anterior compartment. The sartorius muscle is innervated by the femoral nerve.
The femoral nerve is responsible for innervating several other muscles in the lower limb, including the iliacus, pectineus, and all four heads of the quadriceps. The femoral nerve also gives rise to the saphenous nerve, which is the terminal cutaneous branch. This nerve is important as it provides sensory innervation to the medial side of the leg, including the knee and foot.
The sartorius muscle originates from the anterior superior iliac spine and crosses obliquely across the upper and anterior part of the thigh. It then passes behind the medial condyle of the femur and ends in a tendon that joins the tendons of the gracilis and semitendinosus muscles. This point of insertion is known as the pes anserinus, and the muscle inserts into the superomedial surface of the tibia.
The name "sartorius" comes from the Latin word "sartor," meaning tailor. This name likely refers to the cross-legged position in which tailors once sat, demonstrating all four actions of the sartorius muscle. Antique sewing machines also required continuous crossbody pedaling, which would have led to particularly developed sartorius muscles in tailors.
The sartorius muscle plays a role in moving the hip and knee joints. It can flex, abduct, and laterally rotate the femur at the hip joint. At the knee joint, it can flex the leg and medially rotate it when the knee is flexed.
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The muscle plays a role in stabilising the pelvis
The longest muscle in the human body is the sartorius muscle, a thin, long, superficial muscle that runs down the length of the thigh. The muscle is believed to be named after the Latin word for "tailor" and is sometimes referred to as the "tailor's muscle". This may be due to the cross-legged position in which tailors once sat, requiring the lateral rotation and flexion of the hip and flexion of the knee, resulting in particularly developed sartorius muscles.
The sartorius muscle plays a 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 muscle crosses both the hip and knee joints, producing movements in both. At the hip joint, the sartorius muscle is capable of flexion, external rotation, and abduction of the leg. The muscle's contraction can also cause flexion of the knee joint and inward, or medial, rotation of the tibia against the femur.
The combination of these movements allows an individual to sit in a cross-legged position, and it is also suggested that the sartorius may play a role in climbing. The sartorius muscle is innervated by the femoral nerve and receives an extensive vascular supply from several sources, including the femoral, deep femoral, and lateral circumflex femoral arteries.
The sartorius muscle is a unique muscle with an important role in stabilising the pelvis and enabling various movements at the hip and knee joints. Its length, often exceeding 50 cm, and functional capabilities make it an essential component of the human body's musculoskeletal system.
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Frequently asked questions
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 capable of flexion, external rotation and abduction of the leg. It can also flex the knee joint and rotate the leg medially.
The name "sartorius" comes from the Latin word "sartor", meaning "tailor". It is sometimes called the "tailor's muscle". This name likely refers to the cross-legged position in which tailors once sat.
