atlas

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Related to atlas vertebrae: 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.

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]

atlas

/at·las/ (at´las) the first cervical vertebra.
Enlarge picture
Atlas. (A), (Top) superior aspect; (bottom) transverse aspect. Note the absence of the body and spinous process. (B), Position.

atlas

(ăt′ləs)
n. pl. at·lases
Anatomy The top or first cervical vertebra of the neck, which supports the skull.

atlas

Etymology: Gk, atlas, to bear, a mythical giant, compelled to uphold the world
the first cervical vertebra, articulating with the occipital bone and the axis.

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.

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.

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]

atlas

See ATLAS BONE.

atlas

the first vertebra of TETRAPODS, linking skull and axis.

atlas,

n C1, the first cervical vertebra. The skull sits upon this vertebra, which allows the head to tilt forward and backward. The atlas rests on the axis, allowing for rotation. See also axis.
Enlarge picture
Atlas.

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]

atlas,

n the first cervical vertebra articulating superiorly with the occipital bone and inferiorly with the axis (second cervical vertebra).

atlas

the first cervical vertebra, the uppermost segment of the backbone which supports the skull, characterized by the absence of a body and a wide vertebral canal.
References in periodicals archive ?
The atlas vertebrae were evaluated for four linear measurements.
Since the cranial base is connected to the atlas vertebral column by the notochord in early embryogenesis, and the jaws are attached to the cranial base, the cranial base could be the developing link between the atlas vertebrae and the jaws.
Thus the morphology of the atlas vertebrae is affected by the genetic and epigenetic factors.
that may influence the musculature which may cause alterations in the biomechanical loading of the atlas vertebrae thus affecting their growth and development
Several 2D studies have evaluated the variations in the dimensions of atlas vertebrae and their association with skeletal malocclusions.
CONCLUSION: In the present study an association has been shown between morphological deviations of the atlas vertebrae and the skeletal malocclusions (Skeletal open bite and skeletal deep bite).
c) Atlas vertebrae with complete posterolateral ponticuli--1 (Figure 6)
Atlas vertebrae with incomplete & complete ponticuli--2
noted dehiscence of the inferior part of the middle of posterolateral ponticulus in 4 out of 350 atlas vertebrae, an extension of this gap rostrally could cause separation of lateral and posterior ponticuli.