Renal pyramids
McGraw-Hill Science & Technology Dictionary:
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renal pyramid
(′rēn·əl ′pir·ə·məd)
(anatomy) Any of the conical masses composing the medullary substance of the kidney. Also known as Malpighian pyramid.
American Heritage Stedman's Medical Dictionary:
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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.
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Renal pyramids
| Renal pyramids | |||
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| Vertical section of kidney. | |||
| Latin | pyramides renales | ||
| Gray's | subject #253 1221 | ||
Renal pyramids (or malpighian pyramids) are cone-shaped tissues of the kidney. The renal medulla is made up of 7 to 18 of these conical subdivisions (usually 7 in humans). The broad base of each pyramid faces the renal cortex, and its apex, or papilla, points internally. The pyramids appear striped because they are formed by straight parallel segments of nephrons.
Additional images
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Frontal section through the kidney
The base of each pyramid originates at the corticomedullary border and the apex terminates in a papilla, which lies within a minor calyx, made of parallel bundles of urine collecting tubules.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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