Introduction: Our aim was to study the extensor carpi radialis longus muscle on the basis of development in 100 cadavers in India. Materials & Methods: This study on extensor carpi radialis longus was performed on 100 (200 specimens of superior extremities) embalmed donated cadavers (90 males & 10 females) in the department of Anatomy of K.J.Somaiya Medical College, Sion, Mumbai, India. Observations: Out of 200 specimens the variation was observed in 22 specimens. The extensor carpi radialis brevis was absent and the extensor carpi radialis longus was giving two tendons in the second compartment of extensor retinaculum before its insertion while passing deep to the abductor pollicis longus. The arterial pattern of upper limb were also observed. The variation was unilateral. The left upper limb was normal. Conclusions: A lack of knowledge of such type of variations might complicate surgical repair.