Everything about The Sartorius Muscle totally explained
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, 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" (for example "to do with tailoring", in turn from
sartor for example "tailor", in turn from
sartus for example "patched" or "repaired", in turn from
sarcio for example "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, 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 (p.606).
Additional images
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.
Further Information
Get more info on 'Sartorius Muscle'.
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