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گواهی نمایه سازی مقاله Histomorphological studies of the prenatal development of oesophagus of one humped camel (camelus dromedarius)

عنوان مقاله: Histomorphological studies of the prenatal development of oesophagus of one humped camel (camelus dromedarius)
شناسه (COI) مقاله: JR_AAJ-1-4_006
منتشر شده در ماهنامه پیشرفت های کشاورزی در سال ۱۳۹۱
مشخصات نویسندگان مقاله:

a bello - Department of Veterinary Anatomy, Usmanu Danfodiyo University, Sokoto, Nigeria.
b.i onyeanusi - Department of Veterinary Anatomy, Ahmadu Bello University Zaria.
m.l sonfada - Department of Veterinary Anatomy, Usmanu Danfodiyo University, Sokoto, Nigeria.
j.b Adeyanju - Department of Veterinary Anatomy, Usmanu Danfodiyo University, Sokoto, Nigeria.

خلاصه مقاله:
A Histomorphological study was conducted on the oesophagus of 35 foetuses of the one-humped camel collected from the Sokoto metropolitan abattoir, over a period of five months at different gestational ages. The approximate age of the foetuses was estimated from the crown vertebral rump length (CVRL) and samples were categorised into first, second and third trimester. At the first trimester, only three layers were identified, ie; Tunica mucosa, Tunica muscularis and Tunica adventitia. At the second trimester, the orientation of fibres changed, resembling that of the adult with all the four layers prominent i.e. Tunica mucosa, Tunica sub-mucosa, Tunica muscularis and Tunica adventitia. At the third trimester, the Oesophageal gland appeared prominently in the tunica sub-mucosa resembling that of the adult camel. The Tunica mucosa epithelium was simple squamous epithelium at first trimester and began to change at second trimester to stratified squamous epithelium. At third trimester, the epithelium was keratinized stratified squamous epithelium with the oesophageal (sub-mucosal) glands appearing to be prominent and abundant. The tunica muscularis showed clearly a single layer at second trimester while at third trimester; both inner circular and outer longitudinal layers appeared. The tunica adventitia was typical. Blood vessels and nerve fibres became very visible at the tunica sub-mucosa and muscularis in third trimester fetuses. Basedon the above findings, it showed that development of the camels’ oesophagus (based on embryonic stages) was morphological insuccession. Presence of keretinised stratified squamous epithelium throughout the length of the oesophagus showed adaptive featuresof the animal to its environment and mode of feeding. Base on histological differentiation, camels’ oesophagus had little/few similarities with true ruminants embryologically.

کلمات کلیدی:
Camel ، Histomorphological ، Oesophagus ، Prenatal development ،

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