Sartorius muscle

Sartorius muscle
Muscles of lower thigh. (Rectus femoris removed to reveal the vastus intermedius.)
Details
Origin	Anterior superior iliac spine of the pelvic bone
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
Identifiers
Latin	musculus sartorius
TA	A04.7.02.016
FMA	22353
Anatomical terms of muscle []

The sartorius muscle (/sɑːrˈtɔəri.əs/) is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. Its upper portion forms the lateral border of the femoral triangle.

The sartorius muscle is the longest muscle in the body and 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 semitendinosus muscles which together form the pes anserinus, finally inserting into the proximal part of the tibia on the medial surface of its body.

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)

Slips of origin from the outer end of the inguinal ligament, the notch of the ilium, the ilio-pectineal line or the pubis occur.