Morphogenesis of lingual papillae of one‐humped camel (Camelus dromedarius) during prenatal life: A light and scanning electron microscopic study

Abstract

SummaryThis study was made on 24 camel fetuses of crown-rump vertebral length (CVRL) ranging from 10.5 cm to 105 cm CVRL (94-352 days old). These camel fetuses were classified into three groups representing the three trimesters of prenatal life. During the first trimester (94-142 days), lingual papillae (circumvallate and lentiform papillae)were demonstrated on the lingual root, but lingual body and the apex were almost free of papillae except for some scattered epithelial projections especially near the lateral borders of the body. In the second trimester (152-229 days), the lentiform papillae covered the entire root of the tongue except for areas occupied by the circumvallate papillae. Taste buds with clear pores were observed for the first time in areas between the circumvallate gustatory furrow and surface epithelium of the tongue. In addition, short numerous filiform papillae were observed on the rostral part of the lingual body and the lateral parts of the apex. Fungiform papillae, however, were demonstrated amidst the filiform papillae. In this trimester, taste buds were also seen on the top of the fungiform papillae. In the third trimester (256-352 days), all lingual papillae were clearly demonstrated on the dorsum of the root, body and apex of the tongue. Both types of gustatory papillae (circumvallate and fungiform) had well-developed taste buds. Mechanical papillae (filiform and lentiform) were well developed. Lentiform papillae occupied most of the dorsal aspect of the Torus linguae; they were larger in size with semicircular apices. Filiform papillae, however, were numerous and demonstrated heavily on the lateral and rostral parts of the body as well as on the apex of the tongue.

Morphogenesis of the New Zealand white rabbit tongue (Oryctolagus cuniculus)

“…However, their shapes are dissimilar from those of the corresponding papillae in adults. While in animals having a long gestational period, most of their developmental differentiations occurred during the prenatal life, and complete their maturation postnatal as in Red Sokoto goat (Igbokwe & Okolie, 2009) and in camel (Abou‐Elhamd, Abd‐Elkareem, & Zayed, 2018). In summary, the observations detected in this study exhibited that there are considerable changes involved during the development of the histological structure of the tongue and protrusions of papillae throughout the stage from day 16 to day 28 of prenatal ages, which is prolonged till after birth.…”

Developmental morphological analyses on the preglottal salivary gland in Japanese quails (Coturnix japonica)

“…All specimens were mounted on aluminum stubs covered with carbon tabs, sputtered with gold. The prepared specimens were examined and photographed using JEOL SEM (JSM-5400) at an accelerating voltage of 15 kv in the electron microscope unit of Assiut University (Abou-Elhamd, Abd-Elkareem, & Zayed, 2018). The nomenclature used in the present study was coped with the (Nomina Anatomica Avium) as well as that was synonymized and homologized with names in previous and recent studies of the chicken and other avian species by different authors.…”