- Sartorius muscle
Sartorius muscle Muscles of lower extremity. (Rectus femoris removed to reveal the vastus intermedius.) Latin musculus sartorius Gray's subject #128 470 Origin inferior to the anterior superior iliac spine Insertion anteromedial surface of the upper tibia in the pes anserinus Artery femoral artery Nerve femoral nerve (sometimes from the intermediate cutaneous nerve of thigh) Actions Flexion, abduction, and lateral rotation of the hip, flexion of the knee
Origin and insertion
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.
There are four 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. Another 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. A third is that the muscle closely resembles a tailor's ribbon. Additionally, antique sewing machines required continuous cross body pedalling. This combination of lateral rotation and flexion of the hip and flexion of the knee gave tailors particularly enlarged sartorius muscles.
Assists in flexion, abduction and lateral rotation of hip, and flexion of knee. Looking at the bottom of one's foot, as if checking to see if one had stepped in gum, demonstrates all four actions of sartorius.
Situated in the anterior fascial compartment of the thigh, the sartorius is innervated via the anterior (or superficial) branch of the femoral nerve (AORN Journal, J. Murauski). The femoral nerve is responsible for both sensory and motor components in the sartorius and provides proprioceptive feedback for the muscle (Anatomy and Physiology 5th edition, K. Saladin)
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 is made up from the tendons of the gracilis, semitendinosus, and sartorius muscles; these tendons attach on to the anteromedial proximal tibia. When inflammation of the bursa underlying the tendons occurs they separate from the head of the tibia (eMedicine, MD. M. Glencross).
The tendon of insertion may end in the fascia lata, the capsule of the knee-joint, or the fascia of the leg.
- 208339022 at GPnotebook
- LUC sart
- SUNY Labs 14:st-0407
- Cross section at UV pembody/body15a
- Cross section at UV pelvis/pelvis-e12-15
List of muscles of lower limbs (TA A04.7, GA 4.465) ILIAC Region
BUTTOCKS THIGH /
compartmentsfibularis muscles (longus, brevis)
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