Light and electron-microscopic studies on the intestine with emphasis on distribution of endocrine and lymphoid tissue in goat (Capra hircus)
Abstract
Sixteen goats of 8 to 10 months of age were used to study the gross localization of lymphoid
tissue, histology, histochemistry, scanning and transmission electron microscopy of the small and large
intestine of goat. The ileal Peyer’s patch was in the form of a continuous strip. The solitary lymphoid
nodules were mainly confined to the distal colon and rectum. The villi were of different shapes and
sizes were present in small intestine. The epithelium was simple columnar with goblet cells. The
enterochromaffin cells were present in all segments of intestine. The intestinal glands showed presence
of both acidic and neutral polysaccharides along with hyaluronic acid and sialomucins. The Brunner’s
glands were tubulo-alveolar and mucus in nature. The Peyer’s patches along with follicle associated
epithelium (FAE) were observed in small intestine. The villi were absent throughout the length of large
intestine. The lining epithelium was formed by simple columnar with goblet cells in all segments of
large intestine. The intestinal glands showed predominance of acidic mucopolysaccharides. The
lymphoid aggregates were observed in all the parts of large intestine. The tissues from various regions
of small and large were examined for scanning electron microscopy. The scanning electron microscopy
showed corrugations on villi surface. The mucosal surface of large intestine was thrown in to mucosal
folds. These crypts were evenly and densely distributed. The crypts were circular in outline and these
were surrounded by mound like structure. The transmission electron microscopy showed fine structure
of different regions of small and large intestine.
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