Morphotopographic particularities of some muscles from the trunk region of the coypu

The muscles from the trunk region are covered by the cutaneous trunk muscle which has in its structure two layers, a superficial and a profound one. The skin muscle of the trunk has a unitary structure, flattened appearance, inserted on the shoulder and on the base of the tail. The muscular particularitis of the trunk region in coypu consist in their appearance and development. At the level of the trapezius muscle, there is a large interstitium that separates its cervical portion from the thoracic portion. The thoracic ventral serrated muscle, the intercostal muscles and some muscles that are not described in other domestic mammals, namely, the lower ribs muscles and the thoracic square muscle, were also dissected. Among the pectoral muscles of the deep layer, the subclavicular muscle was also identified in coypu. The abdominal, dorsal and ventral muscles were also dissected. The superficial pectoral muscle showed a flattened and triangular aspect.During dissection, it was found that the superficial inguinal ring presents the muscular cruses which are generated by muscular structures