Introduction and objectives: Muscular variations in the lower limb are very common. They have been described by many authors when performing cadaveric dissections and when using the different imaging techniques. Materials and Methods: Twenty lowerlimbs of adult cadavers, were dissected. Lower limbs deformed by trauma, malformations and scars were excluded. The compartment was examined for the presence of an accessory muscle. If this is present, the dissection was extended and the site of its origin and insertion and passage in the reromalleolar groove was noted. Result: A peroneus quartus was present in 1(5%) of the 20 legs. Peroneus quartus are origin from the posterior intermuscular septum and inserted on to the retrotrochlear eminence of the calcaneus bone. Conclusions: This study will supplement our knowledge on the possible variations of the muscles in this region, which would be useful for lower limbs surgeons