MURINE DUODENUM DOES NOT GO THROUGH A SOLID CORE STAGE IN ITS EMBRYOLOGICAL DEVELOPMENT

Embryological development of duodenum is believed to go through a ''so lid core'' stage which subsequently vacuolizes. Failure of vacuolizati on is thought to be the cause of duodenal atresia. This study examines the embryological development of rat duodenum. Thirty-six time-mated Sprague-Dawley rats were studied. Six fetal duodenal specimens were ob tained for each gestational day from day 9 to day 20. These specimens were fixed with formalin, sectioned. stained with haematoxylin and eos in and examined under microscope. The duodenal diameters and the lumen diameters at each gestational date were measured. The foregut started to form at the gestation stage of day 10. The lumen was narrowest on days 12 and 13, but the duodenum did not become a ''solid core''. No v acuolization was detected through out the development of the duodenum. Embryological development of rat duodenum did not go through a ''soli d core'' stage.