atlas

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Related to atlas vertebra: axis vertebra

atlas

 [at´las]
the first cervical vertebra, the uppermost segment of the vertebral column, which supports the skull.
 Atlas. (A), (top) superior aspect; (bottom) transverse aspect. Note the absence of the body and spinous process. (B), position. From Dorland's, 2000.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

at·las

(at'las), [TA]
First cervical vertebra, articulating with the occipital bone and rotating around the dens of the axis.
[G. Atlas, in Greek mythology, a Titan who supported the heavens on his shoulders]
Farlex Partner Medical Dictionary © Farlex 2012

atlas

(ăt′ləs)
n. pl. at·lases
Anatomy The top or first cervical vertebra of the neck, which supports the skull.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

ATLAS

Cardiology
(1) Assessment of Treatment with Lisinopril and Survival. A trial comparing the effects of high to low doses of Zestril®/lisinopril on morbidity and mortality (M&M) in patients with CHF.
 
Logistics
Randomised, double-blind, parallel-group; 3164 patients.
 
Conclusion
Combined risk of mortality and hospitalisation was 12% lower in the high-dose group.
 
(2) Acolysis during Treatment of Lesions Affecting Saphenous Vein Bypass Grafts. A trial evaluating the use of percutaneous CUT for managing thrombosed coronary SVGs.
 
Primary endpoint
Composite (minimum) lumen diameter <30%, TIMI-3 flow, 30-day freedom from MACE; was achieved in 54% of CUT patients vs 73% of abciximab patients.
 
Logistics
Randomised, controlled, multicentre; 191 patients (92 CUT, 89 abciximab followed by PCI).
 
Conclusion
CUT should not be used during PCI of thrombosed SVGs.

Oncology
Adjuvant Tamoxifen Longer Against Shorter. A trial that asked the optimal duration of adjuvant tamoxifen (a SERM) therapy in women with early breast CA.
 
Logistics
Randomised, international; 13752 enrolled.
 
Sports medicine
Athletes’ Training and Learning to Avoid Anabolic Steroids. A multi-component school-based program for male high school athletes (age 13 to 19), which capitalises on team-centred dynamics and uses positive peer pressure and role modelling to reduce the use of anabolic steroids, alcohol and other drugs.
 
Intervention
A highly scripted 10-session curriculum.
 
Results
New substance use and anabolic steroid use decreased by 50%; drinking and driving decreased by 25%; decreased use of drugs, alcohol and performance-enhancing agents; increased exercise and nutrition.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ATLAS

Cardiology A five-yr, randomized, double-blind trial–Assessment of Treatment with Lisinopril & Survival–which evaluated the effect of high vs low doses of Zestril®/lisinopril on M&M in Pts with CHF; high doses appear to be effective. See Lisinopril Sports medicine A 5-yr controlled trial–Athletes' Training and Learning to Avoid Anabolic Steroids begun in 1993 and funded by the National Institute of Drug Abuse. See Anabolic steroids.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

at·las

(at'lăs) [TA]
First cervical vertebra, articulating with the occipital bone and rotating around the dens of the axis.
Synonym(s): vertebra C1.
[G. Atlas, in Greek mythology, a Titan who supported the heavens on his shoulders]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

atlas

See ATLAS BONE.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

atlas

the first vertebra of TETRAPODS, linking skull and axis.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

at·las

(at'lăs) [TA]
First cervical vertebra, articulating with the occipital bone and rotating around the dens of the axis.
[G. Atlas, in Greek mythology, a Titan who supported the heavens on his shoulders]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Among all cervical vertebrae, the atlas vertebra shows the highest variability [28].
In order to describe the posterior arch of atlas vertebra extensively, we used Hasan's protocol and divided the class I vertebra into two subclasses--with deeper and with shallower groove for the vertebral artery.
Morphometric analysis of superior articular facets of atlas vertebra and its clinical applications in ergonomics of atlanto-occipital joints.
External nudges are used to cause the atlas vertebra to recoil into a normal alignment.
RESULTS AND DISCUSSION: Atlas vertebra was fused to axis in such a way that odontoid process is deflected markedly backwards and to left uniting with facet at the anterior arch and its summit looks upwards and lying altogether above anterior arch of atlas and displaced from centrum of axis.
Association between morphology of the first atlas vertebra, head posture, and craniofacial structures.
Shilpa N Gosavi,, Vatsalaswamy P, Morphometric Study of the Atlas Vertebra using Manual Method: Malaysian Orthopaedic Journal 2012 Volume 6 No 3.
Abnormal foramina on the posterior arch of atlas vertebra. International Journal of Anatomical Variation, 1: 21-22.
In the atlas vertebra, the retroarticular canal and the lateral bridge are examples of bony outgrowth or exostosis which may cause external pressure on the vertebral artery as it passes from the foramen transversarium of the atlas vertebra to the foramen magnum of the skull.
Gardner E1 and Davies F2 suggested that the posterior arch of atlas vertebra which corresponds to the laminae of other vertebrae, presents a wide groove for the vertebral artery on its upper surface.
Congenital bony fusion of the atlas vertebra to the base of the occipital bone of the skull is described as assimilation of the atlas.