Sartorius
Thigh
The longest muscle in the body — it crosses your leg like a tailor sitting cross-legged (sartor = tailor in Latin).
Function
Flexes, abducts, and laterally rotates hip; flexes knee
Origin
Anterior superior iliac spine (ASIS)
Insertion
Pes anserinus (medial proximal tibia)
Innervation
Femoral nerve (L2-L3)