Vol. 9, Issue 3, Part E (2024)

Author(s): Rusul Thamer Ali and Jafar Ghazi Abbas Al-Jebori

Abstract: This study was conducted at Al-Qassim Green University, Collage of Veterinary Medicine, Anatomy and Histology Branch. The experiment was designed to study the tongue of awassi sheep fetuses: perinatal period samples (20 male and female) were collected from healthy females uterine and divided according to age groups into two groups by crown rump length formula (CRL) for the prenatal stage. Group I (50-55) days of gestation, Group II (70-75) days of gestation containing 10 foetii each to record the developmental changes in the tongue and its papillae. In the first group (50-55), the tongue was in the process of development, as it was not fully development and The tongue appeared elongated tape cord-like shape structure with a flat surface and almost uniform in thickness and width throughout its length. While histologically showed three layers: tunica mucosa with primitive of lingual papillae, undifferential mesenchymal tissue (pluripotiantial tissue) and tunica muscularis. In the second group (70-75), the tongue appear more development of the pervious stage occupies the greater part of proper oral cavity and extends into the oropharynx, dorsal surface of the tongue appeared rough showing beginning of formation of lingual papillae scattered mostly at the tip and on the dorsum-linguae and very shallow elevation of tours linguae; while histologically, The stratification of epithelium on dorsum of tongue in both stage were thick and it thickness continues in the different height level reaching to tip and lateral borders and surfaces of the tongue at different places, while at ventral surface of the tongue, the degree of stratification was highly increase.

DOI: 10.22271/veterinary.2024.v9.i3e.1437