Histological comparison between the esophagus' cervical region of collared peccary (Tayassu tajacu LINNAEU - 1758) and of wild board (Sus scrofa scrofa linnaeu - 1758)

Abstract

Although raising collared peccaries and wild boars in Brazil is increasing due to the growing economic importance of that activity, only a few histological data are available on both species. The objective of this paper was to describe the histology of the cervical portion of the esophagus of collared peccaries and wild boards by comparing them. It has been observed that this portion of a wild board's esophagus is composed of a mucosa without muscularis mucosæ, sub-mucosa with a large number of glands, muscular tunica with only skeletal striated muscle and serosa. On the other hand, in collared peccaries' esophagus there is mucosa with muscularis mucosæ, sub-mucosa without glands, muscular tunica and serosa. Therefore, it would be correct to say that the cervical portion of a wild boar's esophagus and that of a collared peccary have many different histological characteristics.