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 ?
The left sacral ala on a T1-weighted image shows a low intensity (a), a T2-weighted image shows a high intensity (b), and on a STIR image shows a high intensity (c) compared with the right sacral ala.
Pattern 'H', butterfly pattern on sacral ala, Honda sign are Characteristic of bone scan, Simple conservative management with calcium supplementation is sufficient.
The probe was placed in the sagittal plane across the caudal border of the transverse process of L5 and the cranial border of the sacral ala, visualizing the interspace (osteofibrotic tunnel) in-between the bony structures on both images.
Caudal to the transverse process of L5, the iliopsoas fascia is tied down to the sacral ala and separates the PPC from the iliopsoas compartment [28].
PMM, major psoas muscle; S, sacral ala; TP L4-5, transverse processes of the fourth and fifth lumbar vertebral bodies.