Sartorius muscle
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| Sartorius muscle | ||
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| Muscles of lower extremity. | ||
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| Muscles of the iliac and anterior femoral regions. (Sartorius is vertical 's' shaped muscle at center.) | ||
| Latin | musculus sartorius | |
| Gray's | subject #128 470 | |
| Origin: | superior to the anterior superior iliac spine | |
| Insertion: | medial side of the upper tibia in the pes anserinus together with the gracillis muscle and the semitendinosus muscle | |
| Blood: | ||
| Nerve: | L3, L4 | |
| Action: | ||
| Dorlands/Elsevier | m_22/12547605 | |
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.
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[edit] Origin and insertion
The sartorius muscle arises by tendinous fibers 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, finally inserting into the proximal part of the tibia on the medial surface of its body.
[edit] Etymology
The name sartorius is the Latin word for "sartorial" (i.e. "to do with tailoring", in turn from sartor i.e. "tailor", in turn from sartus i.e. "patched" or "repaired", in turn from sarcio i.e. "to patch", "to repair").
This name was chosen in reference to the cross-legged position in which tailors once sat.
[edit] Action
The action of sartorius is to cross the legs, by flexion of the knee, and flexion and lateral rotation the hip. Sartorius does not have a very strong action.
[edit] Innervation
Situated in the anterior fascial compartment of the thigh, sartorius is innervated via branches of the femoral nerve.
[edit] Variations
Slips of origin from the outer end of the inguinal ligament, the notch of the ilium, the ilio-pectineal line or the 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.
[edit] Additional images
 Structures surrounding right hip-joint. |
 Cross-section through the middle of the thigh. |
 Muscles of the gluteal and posterior femoral regions. |
 Femoral sheath laid open to show its three compartments. |
 The left femoral triangle. |
 The lumbar plexus and its branches. |
 Front and medial aspect of right thigh. |
[edit] External links
- GPnotebook 208339022
- LUC sart
- SUNY Labs 14:st-0407
- Cross section at UV pembody/body15a
- Cross section at UV pelvis/pelvis-e12-15
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
