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Abstract
This work was carried out to investigate the structure of the buffalo’s abomasum to know how to gain a higher body weight from the different rations. This investigation was done on 9 abomasums of Egyptian water buffalo (Bos bubalus) of apparently healthy ones. Each samples was examined both by light and transmission electron microscope. Light microscopical samples were taken from different parts of the abomasum. Also, electron microscopic samples were taken from the same parts of light samples.
The obtained results revealed the following
The abomasum consisted of three parts: transitional gland zone. fundic gland zone and pyloric gland zone.
I. Transitional gland zone
In this region the epithelium changed abruptly from stratified squamous keratinized epithelium to simple columnar epithelium. These glands were distributed in a narrow zone of abomasum Continuous to the omasum. Each gland could be divided into neck and body regions.
By EM, the transitional gland zone was lined by a special type of columnar cells and fibrillovesicular cells. The special type of columnar cells had a broader bases than their apices and their nuclei were angular somewhat compressed. their cytoplasm was occupied by very large polyhedral electron lucent granules in addition to small electron dense granules in other cells. The fibrillovesicular cells were cuboidal to polyhedral in shape. their cytoplasm was characterized by presence of many vesicles or vacuoles in addition to aggregates of microfi laments.
The neck of the transitional gland consisted of mucous neck cells and some immature cells (preparietal cell and immature chief cells). Preparietal cells were characterized by presence of many oval shaped mitocho few numbers of electron dense granules and membrane limited tubules and vesicles. Immature chief cell had numerous cored secretory granule.
The body consisted of cuboidal cells had electron lucent granules filling most of the cytoplasm.
II. Fundic gland region
The fundic gland was about 2/3 of the abomasum, it was marked by thick mucosal fold. The fundic glands were long straight branched tubular gland. occupying the majority of the mucosal thickness.
The fundic gland region was divided into isthmus, neck and body. The isthmus consisted of immature cells and few parietal cells, these immature cells included: mini granule cells characterized by few number if dense granules. immature cells having 2 types of secretory granules. premucous neck cells having granules similar to mucous neck cells and preparietal cells which were characterized by their squat shape and, presence of membrane limited tubules and vesicles.