sacrum

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sacrum

 [sa´krum]
the triangular bone at the base of the spine formed by usually five fused vertebrae wedged dorsally between the two hip bones. See Appendix 3-3.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

sa·crum

, pl.

sa·cra

(sā'krŭm, sā'kră), [TA]
The segment of the vertebral column forming part of the pelvis; a broad, slightly curved, spade-shaped bone, thick above, thinner below, closing in the pelvic girdle posteriorly; it is formed by the fusion of five originally separate sacral vertebrae; it articulates with the last lumbar vertebra, the coccyx, and the hip bone on either side.
[L. (lit. sacred bone), neuter of sacer (sacr-), sacred]
Farlex Partner Medical Dictionary © Farlex 2012

sacrum

(sā′krəm, săk′rəm)
n. pl. sacra (sā′krə, săk′rə)
A triangular bone made up of five fused vertebrae and forming the posterior section of the pelvis.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

sa·crum

, pl. sacra (sā'krŭm, -kră) [TA]
The segment of the vertebral column forming part of the pelvis; a broad, slightly curved, spade-shaped bone, thick above, thinner below, closing in the pelvic girdle posteriorly; it is formed by the fusion of five originally separate sacral vertebrae; it articulates with the last lumbar vertebra, the coccyx, and the hip bone on either side.
[L. (lit. sacred bone), neuter of sacer (sacr-), sacred]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Enlarge picture
SACRUM AND COCCYX: (ANTERIOR VIEW)

sacrum

(sa'krum) [L., sacred]
The triangular bone situated dorsal and caudal from the two ilia between the fifth lumbar vertebra and the coccyx. It is formed of five united vertebrae and is wedged between the two innominate bones, its articulations forming the sacroiliac joints. It is the base of the vertebral column and, with the coccyx, forms the posterior boundary of the true pelvis. The male sacrum is narrower and more curved than the female sacrum.
Synonym: sacral bone See: illustration
Medical Dictionary, © 2009 Farlex and Partners

sacrum

The large, triangular, wedge-like bone that forms the centre of the back of the PELVIS and the lower part of the vertebral column. The sacrum consists of five fused, broad vertebrae and terminates in the tail-like COCCYX.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

sacrum

the collection of fused sacral vertebrae attached to the PELVIC GIRDLE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Sacrum

The triangle-shaped bone located between the fifth lumbar vertebra and the coccyx that consists of five vertebrae fused together. The sacrum joins on each side with the bones of the pelvis.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
3H) and two showed dorsal deficient wall and unfused sacral vertebrae. These seven sacra were included only for studying the shape of sacral hiatus and were excluded from the study for evaluation of rest of the parameters.
Lumbarisation of first sacral vertebrae is a very rare lumbosacral transitional vertebral (LSTV) anomaly necessitating the ability to accurately identify and number the affected segment.
During routine Osteology classes, we observed the articulated skeleton in our department showing partial lumbarisation of the first sacral vertebrae on the left side.
Cheng & Song (2003) reports lumbarisation of first sacral vertebrae is less common compared to sacralisation of fifth lumbar vertebrae the incidence is very low approximately ~2% of the population.
Wellik et al., showed that in the absence of Hox11 function, sacral vertebrae are not formed and instead these vertebrae assume a lumbar identity.
Lumbarisation of first sacral vertebrae is a very rare form of lumbosacral transitional vertebral anomaly necessitating the ability to accurately identify and number the affected segment.
The aorta was found along with the ventral surface of lumbar and sacral vertebrae, dorsally to the colon, following the caudal vena cava to the right, with the Psoas major, Psoas minor and Quadratus lumborum.