follow Dictionary.com

Is Tuesday named for a one-handed god?

renal pyramid

renal pyramid in Medicine

renal pyramid n.
Any of various pyramidal masses that are seen upon longitudinal section of the kidney and that contain part of the secreting tubules and the collecting tubules. Also called malpighian pyramid, medullary pyramid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Encyclopedia Article for renal pyramid

renal lobe

any of the triangular sections of tissue that constitute the medulla, or inner substance, of the kidney. The pyramids consist mainly of tubules that transport urine from the cortical, or outer, part of the kidney, where urine is produced, to the calyces, or cup-shaped cavities in which urine collects before it passes through the ureter to the bladder. The point of each pyramid, called the papilla, projects into a calyx. The surface of the papilla has a sievelike appearance because of the many small openings from which urine droplets pass. Each opening represents a tubule called the duct of Bellini, into which collecting tubules within the pyramid converge. Muscle fibres lead from the calyx to the papilla. As the muscle fibres of the calyx contract, urine flows through the ducts of Bellini into the calyx. The urine then flows to the bladder by way of the renal pelvis and a duct known as the ureter.

Learn more about renal lobe with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Word Value for renal

5
7
Scrabble Words With Friends