Sartorius

Description The sartorius muscle is a thin, long, superficial muscle in the anterior compartment of the thigh (1). It runs down the length of the thigh, runs over 2 joints- hip and knee joints (2) and is the longest muscle in the human body. (1) An exceptional length of this muscle often exceeds 50 cm. (3) In such long  muscles  not  all  muscle  fibres  run through the  whole length of the muscle  belly. (2) It is estimated that at the most 30–50% of fibres run from tendon to tendon. (2) The rest of them end intrafascicularly.(2) The length of a single fibre is  estimated at 35–45 cm. (4)