Multiple Musculotendinous Variations in the Limbs: A Cadaveric Case Report

Muscle and tendon variations in the upper and lower extremities are common but often go unnoticed due to their asymptomatic nature, typically being incidental findings on radiological imaging. These anatomical variations, widely documented in scientific literature, can impact clinical procedures and surgeries. Particularly, the accessory muscles have been implicated in different forms of entrapment neuropathy syndromes. This case report details the muscle and tendon variations observed during the short-term dissection project. The variations included additional muscle in the flexor aspect of the proximal right forearm and additional tendinous slips of abductor pollicis longus forming the boundaries of the anatomical snuffbox in the right wrist of the upper limb. Additionally, we report the presence of additional tendinous slips of the extensor hallucis longus in the left lower limb. From a clinical perspective, recognizing these variations is essential for procedures such as tendon transfers, where an accessory muscle or a tendon could either complicate or facilitate the tendon transfers within the anatomical landscape.