Sartorius muscle
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{{Infobox Muscle |
Name = Sartorius muscle |
Latin = musculus sartorius |
GraySubject = 128 |
GrayPage = 470 |
Image = Sartorius.png |
Caption = Muscles of lower extremity. ([[Rectus femoris]] removed to reveal the [[vastus intermedius]].) |
Image2 = |
Caption2 = |
Origin = superior to the [[anterior superior iliac spine]] |
Insertion = anteromedial surface of the upper [[tibia]] in the [[Pes anserinus (leg)|pes anserinus]] |
Blood = [[femoral artery]] |
Nerve = [[femoral nerve]] (sometimes from the [[Anterior cutaneous branches of the femoral nerve|intermediate cutaneous nerve of thigh]]) |
Action = [[Flexion]] of [[knee]], [[Flexion]] of [[leg]] |
MeshName = |
MeshNumber = |
DorlandsPre = m_22 |
DorlandsSuf = 12547605 |
}}
The '''Sartorius muscle''' is a long thin [[muscle]] that runs down the length of the [[thigh]]. It is the longest muscle in the human body. Its upper portion forms the lateral border of the [[femoral triangle]].
==Origin and insertion==
The sartorius muscle arises by tendinous fibres from the [[anterior superior iliac spine]], running obliquely across the upper and anterior part of the [[thigh]] in an inferomedial direction.
It descends as far as the medial side of the [[knee]], passing behind the [[medial condyle]] of the femur to end in a tendon.
This tendon curves anteriorly to join the tendons of the [[gracilis]] and [[semitendinous]] muscles which together form the [[pes anserinus (leg)|pes anserinus]], finally inserting into the proximal part of the [[tibia]] on the medial surface of its body.
==Etymology==
The name ''sartorius'' is the [[Latin]] word for "sartorial" (i.e. "to do with tailoring", in turn from ''sartor'' i.e. "tailor"<!--(Not to be confused with ''sartor'' meaning "hoer", "weeder", from ''sarrio'')-->, in turn from ''sartus'' i.e. "patched" or "repaired", in turn from ''sarcio'' i.e. "to patch", "to repair").
There are two hypotheses as to the genesis of the name:
One is that this name was chosen in reference to the cross-legged position in which tailors once sat. The other is that it refers to the location of the inferior portion of the muscle being the "inseam" or area of the inner thigh tailors commonly measure when fitting a pant.
==Actions==
Assists in flexion, abduction and lateral rotation of hip, and flexion and medial rotation of knee. Looking at the bottom of one's foot, as if one were checking to see if one had stepped in gum, demonstrates all 5 actions of sartorius.
==Innervation==
Situated in the anterior [[fascial compartment of the thigh]], sartorius is innervated via branches of the [[femoral nerve]].
==Variations==
Slips of origin from the outer end of the [[inguinal ligament]], the notch of the [[ilium (bone)|ilium]], the [[ilio-pectineal line]] or the [[pubis (bone)|pubis]] occur.
The muscle may be split into two parts, and 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 may end in the [[fascia lata]], the capsule of the [[knee-joint]], or the fascia of the leg.
The muscle may be absent ({{cite book
| last = Scott-Conner
| first = Carol E. H.
| coauthors = David L. Dawson
| title = Operative Anatomy
| publisher = [[Lippincott Williams & Wilkins]]
| year = 2003
| chapterurl = http://books.google.com/books?id=06GvkEYPg20C
| isbn = 0781735297 }} p.606).
==Additional images==
<gallery>
Image:Gray258.png|Bones of the right leg. Anterior surface.
Image:Gray344.png|Structures surrounding right hip-joint.
Image:Gray430.png|Muscles of the iliac and anterior femoral regions.
Image:Gray432 color.png|Cross-section through the middle of the thigh.
Image:Gray434.png|Muscles of the gluteal and posterior femoral regions.
Image:Gray545.png|Femoral sheath laid open to show its three compartments.
Image:Gray549.png|The left femoral triangle.
Image:Gray823.png|The lumbar plexus and its branches.
Image:Gray1238.png|Front and medial aspect of right thigh.
</gallery>
==External links==
* {{GPnotebook|208339022}}
* {{MuscleLoyola|sart}}
* {{SUNYAnatomyLabs|14|st|04|07}}
* {{ViennaCrossSection|pembody/body15a}}
* {{ViennaCrossSection|pelvis/pelvis-e12-15}}
{{Gray's}}
{{Muscles of lower limb}}
[[Category:Thigh muscles]]
[[de:Musculus sartorius]]
[[es:Músculo sartorio]]
[[fr:Sartorius]]
[[hr:Krojački mišić]]
[[it:Sartorio]]
[[he:שריר החייטים]]
[[la:Musculus sartorius]]
[[nl:Musculus sartorius]]
[[ja:縫工筋]]
[[pl:Mięsień krawiecki]]
[[sl:Krojaška mišica]]
[[fi:Räätälinlihas]]