title: Histological development of the small intestinal mucosa in the ovine fetus.
abstract: Histological changes in the small intestine of 85 ovine fetuses were studied, with particular reference to the mucosa. In 24-day-old fetuses the endoderm of the intestine consisted of a single layer of epithelium. By the 26th day the epithelium was flattened and stratified. The first evidence of rudimentary villus formation was noted in 39-day-old fetuses. Intestinal glands were first observed at 56 days. Other mucosal structures were present by 101 days. At birth the intestinal mucosa was fully mature.
mesh_terms: D000818:Animals; D004386:Duodenum / Q000196:embryology; D005260:Female; D005333:Fetus; D007082:Ileum / Q000196:embryology; D007413:Intestinal Mucosa / Q000196:embryology*; D007421:Intestine, Small / Q000196:embryology*; D007583:Jejunum / Q000196:embryology; D011247:Pregnancy; D012756:Sheep / Q000196:embryology*