Prenatal Development of Thexx Lenticular Papillae of One-Humped Camel (Camelus dromedarius): Histomorphological Study

Abstract

A histomorphological study was conducted on the prenatal development of camel lenticular papillae using standard histomorphological methods. In the experiment, fifteen Camelus dromedarius foetuses obtained from Sokoto metropolitan abattoir at different gestational ages were used for the study. The fetuses were weighed and grouped according to their gestational ages which were estimated using their crown-vertebral-rump length. From the fifteen (15) samples used for the study, five (5) belongs to the first trimester, five (5) from the second trimester and five (5) belongs to the third trimester. A total of ten (10) foetuses were males and five (5) were females. Grossly, in all the stages of development, the tongues were observed to be elongated, with flat surfaces and rounded at the apices. At first trimester, the tongues were seen as smooth muscle mass, with almost uniform width and thickness throughout the length. They were uniformly pinkish, no pigmentation and no visual evidence of lingual papillae. At second trimester, the tongues were observed to have taken the normal shape of an adult tongue with variable size and shape of lingual papillae; tapering rostrally from the root to the apex. Biometrically, the weight of the foetuses were found to be 0.18±0.05 to 21.70±7.28kg from the first trimester to third trimester, the crown – vertebral – rump – length were found to be 15.75±4.42 to 94.00±2.83cm from the first trimester to the third trimester, weight of the head were found to be 25.05±15.17 to 1120.00±14.14g and weight of the tongues were found to be 0.79±0.22 to 116.25±11.49g from first trimester to third trimester of age. Histological observations showed that the lenticular papillae were generally lined with keratinised stratified (variable degree) squamous epithelium, which was composed by basal, spinosum, lucideum, granulosum and corneum layers. There was no evidence of seromucous glands in all the stages of development.