Postpartum Developmental Morphology of the Siberian Hamster (Phodopus sungorus) Stomach: An SEM Study
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To determine surface changes in the Siberian hamster stomach during postpartum development, stomachs were harvested at birth, and at 1, 4, 8 and 12 weeks postpartum and were processed for scanning electron microscopy. Throughout development. the Siberian hamster stomach consists of two chambers: a forestomach and a glandular stomach. From birth to adult, the only change that occurs in the forestomach is an increase in size. The mucosa is organized into longitudinal folds and is lined by stratified squamous epithelium. Sloughing cells are evident throughout and the luminal cells are characterized by microplicae with rod-shaped bacteria on the surface. Near the junction of the two chambers, the mucosal folds of the forestomach become more closely apposed and curve over to the lesser curvature of the glandular stomach. The second glandular chamber is separated from the forestomach by a crescent-shaped ridge. At birth, the mucosa of the glandular stomach consists of large folds with few small glandular pits. Cell outlines are not distinct giving the surface of the mucosa a smooth appearance. Cell surfaces are densely covered with short microvilli. At the entrance to the pits, some cells are covered with long, shaggy microvilli. By one week of age, a fundic region with long straight tubular glands and a pyloric region with shorter glands can be differentiated. By four weeks of age, the mucosal folds have regressed; however, the pits and individual cell boundaries are more distinct. Cells with long shaggy microvilli are not evident at four weeks. While most surface cells are still covered with short microvilli, some cells have surface areas free of microvilli. In the adult, the surface cells are rounded, and individual cells are clearly demarcated; large pits open to the surface.
Ream, L. J.,
& Scott, J. N.
(1986). Postpartum Developmental Morphology of the Siberian Hamster (Phodopus sungorus) Stomach: An SEM Study. Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology, 214 (3), 36A.