1. Department of Morphology; Health Sciences Center, Federal University of Piaui, Minister Petrônio Portela Campus; CEP: 64059-550 Teresina Piauí Brazil
2. Department of Veterinary Morphology; Center of Agrarian Sciences, Federal University of Piaui, Minister Petrônio Portela Campus; CEP: 64059-550 Teresina Piauí Brazil
3. Departamento of Biophysics and Physiology; Health Sciences Center, Federal University of Piaui, Minister Petrônio Portela Campus; CEP: 64059-550 Teresina Piauí Brazil