pylorus

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pylorus

 [pi-lor´us]
the distal aperture of the stomach, opening into the duodenum. The term has also been used to mean the pyloric part of the stomach, and the pyloric antrum, canal, opening, or sphincter. A ring of muscles, the pyloric sphincter, serves as a “gate,” closing the opening from the stomach to the intestine. It opens periodically, allowing the contents of the stomach to move into the duodenum. The pylorus contains many glands that help produce hydrochloric acid. Occasionally, in infants, the pyloric muscle is greatly enlarged and thickened, so that emptying of the stomach is prevented. This condition, hypertrophic pyloric obstruction or pyloric stenosis, can be corrected by surgery.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

py·lo·rus

, pl.

py·lor·i

(pi-lōr'ŭs, pī-lōr'ī), [TA]
1. The muscular tissue surrounding and controlling the aboral outlet of the stomach.
2. A muscular or myovascular device to open (musculus dilator) and to close (musculus sphincter) an orifice or the lumen of an organ.
[L. fr. G. pylōros, a gatekeeper, the pylorus, fr. pylē, gate, + ouros, a warder]
Farlex Partner Medical Dictionary © Farlex 2012

pylorus

(pī-lôr′əs, pĭ-)
n. pl. py·lori (-lôr′ī′)
The passage at the lower end of the stomach that opens into the duodenum.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

py·lo·rus

, pl. pylori (pī-lōr'ŭs, -ī) [TA]
1. A muscular or myovascular device to open (musculus dilatator) and to close (musculus sphincter) an orifice or the lumen of an organ.
2. The muscular tissue surrounding and controlling the aboral outlet of the stomach.
[L. fr. G. pylōros, a gatekeeper, the pylorus, fr. pylē, gate, + ouros, a warder]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

pylorus

The narrowed outlet of the stomach where it opens into the DUODENUM. At the pylorus, the muscular coats of the stomach wall are thickened to form a strong muscle ring (a SPHINCTER) capable of closing and opening to control the movement of food.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Pylorus

The ring of muscle that controls the passage of material from the stomach into the small intestine.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.