Histogenesis of rumen in one-humped camel (Camelus dromedarius)
Naghani, E.S. (Islamic Azad Univ., Sanandaj (Iran). Dept. of Veterinary Anatomy) | Akradi, L. (Islamic Azad Univ., Sanandaj (Iran). Dept. of Veterinary Pathology)
The aim of this study was to follow several sequence histological changes that occur during the histogenesis of the rumen in one-humped camel (Camelus dromedarius). Histogenesis study was carried out on 66 fetuses of camel from 50th day of gestation until birth (390 days), according to the most relevant histo-differentiation characteristics of the rumen in fetuses, these were divided into four groups: group I (5-24 cm crown-rump length (C-RL); 50-140 days); group II (24-30 cm C-RL; 140-160 days); group III (30-60 cm C-RL; 160-250 days); group IV (60-108 cm C-RL; 250-390 days). At 50 days, the rumen consisted of four layers: the epithelial layer, propria-submucosa, tunica muscularis and serosa. The epithelium glandular region was pseudostratified and in non-glandular region was stratified. The muscularis mucosa was observed incompletely from 140 days between lamina propria and submucosa in glandular region of the rumen to the birth day. The primary lymphatic nodules appeared in lamina propria of glandular region of the rumen at 160 days of gestation. The epithelium of the glandular region in rumen was formed by a simple columnar layer at 250 days. In all groups, the tunica muscularis layer of rumen was increased with ruminal development, gradually. The non-glandular region of rumen was formed by a stratified epithelium and number of these cells increased with ruminal development. The lymphatic nodules and muscularis mucosa in nonglandular region did not observe in all groups. The study observations revealed that non-glandular region of the rumen in the fetuses of camel are less precocious than the rumen of the domestic ruminants.
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