Muscle
Sartorius
Longest muscle in the body
High-yield
Longest muscle in the body; flexes hip and knee and laterally rotates the thigh ("tailor's position"). Femoral nerve.
Overview
A strap-like muscle crossing the anterior thigh obliquely that produces the cross-legged 'tailor' position. It forms the lateral border of the femoral triangle.
Reference facts
- Origin
- Anterior superior iliac spine
- Insertion
- Superomedial surface of the tibia (pes anserinus)
- Action
- Flexes, abducts, and laterally rotates the thigh; flexes the knee
- Innervation
- Femoral nerve (L2, L3)
- Blood supply
- Femoral artery (muscular branches)
Frequently asked questions
What does the sartorius do?
The sartorius flexes, abducts, and laterally rotates the thigh; flexes the knee.
What nerve innervates the sartorius?
The sartorius is innervated by the femoral nerve (L2, L3).
Where does the sartorius attach?
The sartorius originates from the anterior superior iliac spine and inserts on the superomedial surface of the tibia (pes anserinus).
What is the blood supply of the sartorius?
The sartorius is supplied by the femoral artery (muscular branches).