Introduction: A detailed knowledge of the extensor tendons’ anatomy is essentialfor understanding the consequences of tendon injuryat various levels. Extensor tendon injuries can cause serious functional impairment but have not received the attention in the literature as flexor tendon injuries.This study focuses on the variant pattern of the chief extensor tendons on the dorsum of hand. This study also throws light on the the relatively rare extensor digitorum brevis manus, a supernumerarymuscle in the fourth extensor compartment of thedorsum of the wrist. Materials & Methods: 25 upper limbs (13 right and 12 left) of adult cadavers of unknownage and sex, collected from the dissection room at the Anatomy Department, P.K. Das Institute of Medical Sciences, Vaniamkulam, Palakkad were examined to study the basic arrangement of the extensor tendons of the fingers and to determine the presence of variations of these tendons. Results: The number of ED tendons varied from 3 to 8. The incidence of 4 tendons (36%) was the commonest pattern observed in the present study, followed by 5 tendons for ED (20%) and 4 tendons for ED (16%). A single tendon for Extensor digitiminimi was observed in 23 limbs (92%), while the muscle was absent in 2 specimens (8%). The extensor indicis exhibited a single tendon in all the cases. The APL muscle and tendonwere found in all specimens. EPL & EPB were found in all specimens. Two accessory muscles were observed in the dorsum of the hand which were identified asextensordigitorum brevis manus. Discussion: The highest number of variations were observed for the tendons of Extensor Digitorum, the number of tendons ranging from 3 to 8. Extensor digitorum brevis manus muscle was observed in two specimens.The variations observed in the present work, could be due to the variable changes the extensor limb myotomespass through, during ontological development; regression, retention, or reappearance.

Keywords: Extensor; Pollicis; Digitorum; Digitiminimi; Indicis; Tendons; Anatomical; Variations; Digitorum Brevis Manus.