Histogenesis of rumen in one-humped camel (Camelus
dromedarius)
E. Salimi Naghani* and L. Akradi1
Department of Veterinary Anatomy; 1Department of
Veterinary Pathology, Sanandaj Branch, Islamic Azad University,
Sanandaj, Iran *Corresponding author: vet_anatomy@iausdj.ac.ir
Abstract
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
50thday 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 (24-30cm 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 that the number cells were increased with ruminal
development. The lymphatic nodules and muscularis mucosa in non-glandular 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.