European Journal of Zoological Research
Abstract
Author(s): Sajjad Hejazi, Rahman Baroughi
The aim of this study is determining process of lingual papillae tissue development in sheep fetus. The study was
observation and descriptive type and the survey was done on 100 sheep fetuses of Ghezel breed from different age
groups. The desired samples were collected by random sampling . The crown- rump length of collected fetus (CRL)
were measured, and according to the formula: X=2.1 (Y+17) their ages were calculated. The tongue of the fetus
was separated from its head after fixation in formalin 10%, They were surveyed for sampling under microscope for
observation of growth area and development of lingual papillae. The separated samples were examined under light
microscope after histological processing and staining (H&E)the tissue sections. By microscopic observation, which
has been surveyed from 40 days of pregnancy, at first epithelium of tissue was cuboidal and stratified cuboidal cells
and by progress of the developmental period, they obtiand the final form of stratified squamous cells. The
development of the lingual papillae appeared after complete formation of the tongue epithelium tissues. At first, we
observed the mechanical papillae appearance and in the later stages, The taste buds were formed from collection of
tongue epithelium cells which appeared on the tasting papillae. During this process we observed keratinized
epithelium filiform papillae. It may be concluded that the time of developing lingual papillae are dependent to the
final formation of lingual epithelium tissue. It can be Concluded that there is no relationship between the beginning
time of filiform papillae keratinization and the diet of the animal after the birth.
