The sartorius muscle () is the longest muscle in the human body. It is a long, thin, superficial
muscle
Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system and typically are attached by tendons to bones of a skeleton. The muscle cells of skeletal muscles are much longer than in the other types of mus ...
that runs down the length of the
thigh in the
anterior compartment.
Structure
The sartorius muscle originates from the
anterior superior iliac spine
The anterior superior iliac spine ( abbreviated: ASIS) is a bony projection of the iliac bone, and an important landmark of surface anatomy. It refers to the anterior extremity of the iliac crest of the pelvis. It provides attachment for the i ...
,
and part of the notch between the anterior superior iliac spine and
anterior inferior iliac spine
Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position pro ...
. 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
The medial condyle is one of the two projections on the lower extremity of femur, the other being the lateral condyle.
The medial condyle is larger than the lateral (outer) condyle due to more weight bearing caused by the centre of mass being med ...
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 tibia (; ), also known as the shinbone or shankbone, is the larger, stronger, and anterior (frontal) of the two bones in the leg below the knee in vertebrates (the other being the fibula, behind and to the outside of the tibia); it conn ...
.
Its upper portion forms the lateral border of the
femoral triangle, and the point where it crosses
adductor longus marks the apex of the triangle. Deep to sartorius and its fascia is the
adductor canal, through which the
saphenous nerve
The saphenous nerve (long or internal saphenous nerve) is the largest cutaneous branch of the femoral nerve. It is a strictly sensory nerve, and has no motor function.
Structure
It is purely a sensory nerve.
The saphenous nerve is the larges ...
,
femoral artery and
vein
Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated ...
, and nerve to
vastus medialis pass.
Innervation
Like the other muscles in the anterior compartment of the thigh, the sartorius is innervated by the
femoral nerve.
Variation
It may originate from the outer end of the
inguinal ligament, the notch of the
ilium, the
ilio-pectineal line or the
pubis.
The muscle may be split into two parts, and one part may be inserted into the
fascia lata, the
femur
The femur (; ), or thigh bone, is the proximal bone of the hindlimb in tetrapod vertebrates. The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates ...
, the ligament of the
patella
The patella, also known as the kneecap, is a flat, rounded triangular bone which articulates with the femur (thigh bone) and covers and protects the anterior articular surface of the knee joint. The patella is found in many tetrapods, such as ...
or the tendon of the
semitendinosus.
The tendon of insertion may 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.
Function
The sartorius muscle can move the hip joint and the knee joint, but all of 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, sartorius medially rotates the leg.
Sitting cross-legged demonstrates all four actions of the sartorius.
Clinical significance
One of the many conditions that can disrupt the use of the sartorius is
pes anserine bursitis, an inflammatory condition of the medial portion of the knee. This condition usually occurs in athletes from overuse and is characterized by pain, swelling and tenderness. The
pes anserinus involves the tendons of the
gracilis, semitendinosus, and sartorius muscles; these tendons attach onto the anteromedial proximal tibia. When inflammation of the bursae underlying the tendons occurs, they separate from the head of the tibia.
History
The name sartorius comes from the
Latin
Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...
word ''sartor'', meaning tailor,
and it is sometimes called the tailor's muscle.
This name was chosen in reference to the cross-legged position in which tailors once sat.
In French, a muscle name itself "couturier" comes from this specific position which is referred to as "sitting as a tailor" (in French: "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 closely resembles a tailor's ribbon. Additionally, antique sewing machines required continuous crossbody pedaling. This combination of lateral rotation and flexion of the hip and flexion of the knee gave tailors particularly developed sartorius muscles.
Additional images
File:Gray430.png, Muscles of the iliac and anterior femoral regions.
File:Thigh cross section.svg, Cross-section through the middle of the thigh.
File:Gray549.png, The left femoral triangle.
File:Gray1238.png, Front and medial aspect of right thigh.
File:Anatomical dissection4.JPG
File:Slide1rrr.JPG, Sartorius muscle
File:Slide1www.JPG, Sartorius muscle
File:Slide2A.JPG, Sartorius muscle
File:Slide2CCCC.JPG, Sartorius muscle
File:Slide7GGGGG.JPG, Sartorius muscle
File:Slide8NNNNN.JPG, Sartorius muscle
File:Slide2EA.JPG, Muscles of thigh. Cross section.
References
External links
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Hip abductors
Hip flexors
Hip lateral rotators
Knee flexors
Thigh muscles
Anterior compartment of thigh
Muscles of the lower limb