| allantoic diverticulum | An endoderm-lined outpouching of the hindgut (in humans, the yolk sac of a very young embryo) representing the primordium of the allantois; in most amniotes, it grows into the extraembryonic celom; in humans, the distal part of the allantoic lumen is rudimentary, not extending beyond the body stalk. Synonym: allantoenteric diverticulum. (05 Mar 2000) |
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| Rathke's diverticulum | A tubular outgrowth of ectoderm from the stomodeum of the embryo; it grows dorsad toward the infundibular process of the diencephalon, around which it forms a cup-like mass, giving rise to the pars distalis and pars juxtaneuralis of the hypophysis. Synonym: craniopharyngeal canal, hypophyseal pouch, Rathke's diverticulum, Rathke's pocket, Rathke's pouch. (05 Mar 2000) |
| ventricular diverticulum | A congenital outpouching of the right or left ventricle. (05 Mar 2000) |
| vesical diverticulum | A diverticulum of the bladder wall; may be either true or false type. (05 Mar 2000) |
| cervical diverticulum | A diverticulum in the neck derived from retention of part of one of the pharyngeal pouches (endodermal) or branchial grooves (ectodermal) of the embryo. (05 Mar 2000) |
| metanephric diverticulum | An outgrowth from the caudal portion of the mesonephric duct on either side, which grows cephalodorsally to make contact with the masses of metanephrogenous tissue (nephric blastemas) that give rise to the epithelial lining of the ureter and of the pelvis and the collecting ducts of the kidney. (05 Mar 2000) |
| Pertik's diverticulum | An abnormally deep recessus pharyngeus. (05 Mar 2000) |
| pharyngoesophageal diverticulum | Most common diverticulum of the oesophagus; arises between the inferior pharyngeal constrictor and the crico-pharyngeus muscle. Synonym: hypopharyngeal diverticulum, Zenker's diverticulum. (05 Mar 2000) |
| pituitary diverticulum | A tubular outgrowth of ectoderm from the stomodeum of the embryo; it grows dorsad toward the infundibular process of the diencephalon, around which it forms a cup-like mass, giving rise to the pars distalis and pars juxtaneuralis of the hypophysis. Synonym: craniopharyngeal canal, hypophyseal pouch, Rathke's diverticulum, Rathke's pocket, Rathke's pouch. (05 Mar 2000) |
| Heister's diverticulum | <anatomy, vein> One of two dilated parts of the internal jugular vein: the superior bulb (Heister's diverticulum) is a dilation at the beginning of the internal jugular vein in the jugular fossa of the temporal bone; the inferior bulb is a dilat ed portion of the vein just before it reaches the brachiocephalic vein. Synonym: jugular bulb, bulbus venae jugularis. (05 Mar 2000) |
| pulsion diverticulum | A diverticulum formed by pressure from within, frequently causing herniation of mucosa through the muscularis. (05 Mar 2000) |
| hutch bladder diverticulum | <radiology> Bladder tic near uretero-vesical junction, weakens detrusor muscle, may lead to VU reflux (12 Dec 1998) |
| hypopharyngeal diverticulum | Most common diverticulum of the oesophagus; arises between the inferior pharyngeal constrictor and the crico-pharyngeus muscle. Synonym: hypopharyngeal diverticulum, Zenker's diverticulum. (05 Mar 2000) |
| stomach diverticulum | Saccular, outward protrusion of a portion of the mucous membrane of the stomach wall. (12 Dec 1998) |
| Nuck's diverticulum | A peritoneal diverticulum in the embryonic lower anterior abdominal wall that traverses the inguinal canal; in the male it forms the tunica vaginalis testis and normally loses its connection with the peritoneal cavity; a persistent processus vaginalis in the female is known as the canal of Nuck. Synonym: Nuck's diverticulum, processus vaginalis peritonei, vaginal process of peritoneum, vaginal process of testis. (05 Mar 2000) |