Notes in Abdominal Embryology

To Subscribe, use this Key

Status	Last Update	Fields
Published	03/05/2024	As a result of {{c1::cephalocaudal and lateral folding}} of the embryo, a portion of the endoderm derived from gastrulation is incorporated into the e…
Published	03/05/2024	In the cephalic and caudal parts of the embryo, the primitive gut forms a blind-ending tube, the {{c1::foregut and hindgut,}} respectiv…
Published	03/05/2024	The remainder of the foregut lies {{c1::caudal}} to the pharyngeal tube and extends as far caudally as the {{c2::liver outgrowth}}
Published	03/05/2024	The midgut begins caudal to the {{c1::liver bud}} and extends to the junction of the {{c2::right two-thirds and left third}} of the transver…
Published	03/05/2024	The hindgut extends from the {{c1::left third of the transverse colon}} to the {{c1::cloacal membrane}}
Published	03/05/2024	When the embryo is approximately {{c1::4 weeks old,}} the {{c2::respiratory diverticulum (lung bud) }}appears at the ventral wall of the foregut …
Published	03/05/2024	The {{c1::tracheoesophageal septum }}gradually partitions this diverticulum from the {{c2::dorsal part of the foregut}}
Published	03/05/2024	In this manner, the foregut divides into a {{c2::ventral portion}}, the {{c1::respiratory primordium}} and a {{c2::dorsal portion}}, the {{c…
Published	03/05/2024	{{c1::Esophageal atresia and/or tracheoesophageal fistula}} results either from {{c2::spontaneous posterior deviation of the trach…
Published	03/05/2024	Growth to lengthen the {{c1::esophageal region}} is essential for positioning the stomach in the abdominal cavity below the diaphragm. If this growth …
Published	03/05/2024	The stomach rotates {{c1::90 degrees clockwise}} around its longitudinal axis, causing its left side to face {{c2::anteriorly}} and its right side to …
Published	03/05/2024	The terminal part of the foregut and the cephalic part of the midgut form the {{c1::duodenum.}}
Published	03/05/2024	As the stomach rotates, the duodenum takes on the form of a {{c1::C-shaped loop}} and rotates to the {{c1::right.}}
Published	03/05/2024	{{c1::Pyloric stenosis}} occurs when the circular and, to a lesser degree, the longitudinal musculature of the stomach in the region of the pylor…
Published	03/05/2024	The {{c1::liver primordium}} appears in the middle of the third week as an {{c2::outgrowth of the endodermal epithelium}} at the distal end of the {{c…
Published	03/05/2024	In some cases, the ducts, which pass through a solid phase in their development, {{c2::fail to recanalize.}} This defect, {{c1::extrahepati…
Published	03/05/2024	The pancreas is formed by two buds, {{c2::dorsal and ventra}}l, originating from the {{c1::endodermal lining of the duodenum}}
Published	03/05/2024	Whereas the {{c1::dorsal pancreatic bud }}is in the dorsal mesentery, the ventral pancreatic bud is {{c2::close to the bile duct}}
Published	03/05/2024	The ventral bud forms the {{c1::uncinate process }}and inferior part of the head of the pancreas
Published	03/05/2024	In the 5-week embryo, the {{c2::midgut}} is suspended from the dorsal abdominal wall by a short mesentery and communicates with the yolk sac by way of…
Published	03/05/2024	Development of the midgut is characterized by rapid elongation of the gut and its mesentery, resulting in formation of the {{c1::primary intestinal lo…
Published	03/05/2024	As a result of the {{c1::rapid growth and expansion of the liver}}, the abdominal cavity temporarily becomes too small to contain all the intestinal l…
Published	03/05/2024	Coincident with growth in length, the {{c3::primary intestinal loop}} rotates {{c2::270 degrees counterclockwise}} around an axis formed by the {{c1::…
Published	03/05/2024	Because the appendix develops during descent of the colon, its final position frequently is {{c1::posterior to the cecum or colon}}. These positions o…
Published	03/05/2024	Normally, the ascending colon, except for its most caudal part (approximately 1 in), attaches to {{c1::the posterior abdominal wall}}. If the ascendin…
Published	03/05/2024	A {{c1::retrocolic hernia}} is formed when portions of the small intestine posterior to the ascending portion of the colon become entr…
Published	03/05/2024	{{c1::Omphalocele }} involves herniation of abdominal viscera through an enlarged umbilical ring.
Published	03/05/2024	{{c1::Gastroschisis}} refers to a protrusion of abdominal contents through the body wall directly into the amniotic cavity.
Published	03/05/2024	In 2% to 4% of people, a small portion of the {{c1::vitelline duct}} persists, forming an outpocketing of the ileum, {{c2::Meckel diver…
Published	03/05/2024	Occasionally, however, rotation amounts to 90 degrees only. When this occurs, the {{c1::colon and cecum}} are the first portions of the gut to return …
Published	03/05/2024	Atresias in the upper duodenum are probably due to a lack of {{c1::recanalization}}
Published	03/05/2024	The terminal portion of the hindgut enters into the posterior region of the cloaca, the {{c1::primitive anorectal canal}}; the allantois enters i…
Published	03/05/2024	This boundary between the endoderm and the ectoderm forms the {{c1::cloacal membrane}}
Published	03/05/2024	A wedge of mesoderm, the {{c1::urorectal septum}}, grows caudally toward the cloacal membrane and separates the region between the {{c2::ur…
Published	03/05/2024	{{c1::Congenital megacolon }} is due to an absence of parasympathetic ganglia in the bowel wall. These ganglia are derived from {{c2::neural cres…
Published	03/05/2024	{{c1::Annular pancreas}} – part of the ventral bud rotates anterior to the duodenum and causes obstruction of duodenum
Published	03/05/2024	DJJ is to {{c1::left of spine}}, cecum in {{c2::right lower quadrant}}
Published	03/05/2024	{{c1::Bilious emesis}} is {{c2::malrotation with volvulus}} until proven otherwise
Published	03/05/2024	Cloacal membrane ruptures (week 7) with openings for {{c2::urogenital sinus}} and {{c1::anal canal}}
Published	03/05/2024	{{c1::Ectoderm}} proliferates and closes the anal canal, then recanalizes
Status	Last Update	Fields