hemisphere

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hemisphere

 [hem´ĭ-sfēr]
half of a spherical or roughly spherical structure or organ.
cerebral hemisphere one of the paired structures constituting the largest part of the brain, which together comprise the extensive cerebral cortex, centrum semiovale, basal ganglia, and rhinencephalon, and contain the lateral ventricle. See also brain.
cerebellar hemisphere either of the paired portions of the cerebellum lateral to the vermis.
dominant hemisphere the cerebral hemisphere that is more concerned than the other in the integration of sensations and the control of many functions. See also laterality.

hem·i·sphere

(hem'i-sfēr), [TA]
Half a spheric structure.
Synonym(s): hemispherium [TA]
[hemi- + G. sphaira, ball, globe]

hemisphere

(hĕm′ĭ-sfîr′)
n.
1.
a. A half of a sphere bounded by a great circle.
b. A half of a symmetrical, approximately spherical object as divided by a plane of symmetry.
2. Either half of the celestial sphere as divided by the ecliptic, the celestial equator, or the horizon.
3. Either the northern or southern half of the earth as divided by the equator or the eastern or western half as divided by a meridian.
4. Anatomy
a. Either of the lateral halves of the cerebrum; a cerebral hemisphere.
b. Either of the lateral halves of the cerebellum; a cerebellar hemisphere.

hem′i·spher′ic (-sfîr′ĭk, -sfĕr′-), hem′i·spher′i·cal adj.
hem′i·spher′i·cal·ly adv.

hem·i·sphere

(hem'is-fēr) [TA]
Half of a spheric structure.
Synonym(s): cerebral hemisphere (1) , hemisphericum.
[hemi- + G. sphaira, ball, globe]

Hemisphere

One of the two halves or sides-the left and the right-of the brain.
Mentioned in: Aphasia

hem·i·sphere

(hem'is-fēr) [TA]
Half a spheric structure.
[hemi- + G. sphaira, ball, globe]
References in periodicals archive ?
Seeing Antares as the sun rises in the winter sky is a sign than summer is soon to come but the hotness of the coming season is still far away from the Northern Hemisphere. People need to wait to be able to see the Antares over the southeast horizon at night to know that summer is near.
While stratospheric ozone depletion has already been shown to be the primary driver of the expansion of the tropics in the Southern Hemisphere, the researchers are the first to report that black carbon and tropospheric ozone are the most likely primary drivers of the tropical expansion observed in the Northern Hemisphere.
New research on the different hemispheres of the brain made possible by new technologies such as electroencephalography (EEG) and magnetic resonance imaging (MRI) which enable researchers to see where brain activity is occurring when experimental subjects engage in different activities, and to stimulate or put out of action different parts of the brain and observe the effects, along with further research on brain physiology and studies of people with damaged brains (including people with split brains), have provided not only greater understanding of how the different hemispheres work, how they interact and what is their contribution to experience and thought, but also how the hemispheres develop and how they can malfunction.
Geographers also divide Earth into Western and Eastern hemispheres along two other imaginary lines--the prime meridian (0[degrees] longitude) and 180[degrees] longitude.
Drawing his material from many corners of learning, the author contends that the history of ideas, and therefore history itself, can be explained in terms of the sometimes creative and sometimes destructive tension between the hemispheres. Neuroscience is crowded with expert, nerdish describers of tiny islands.
The first covered horses raced or trained in countries that operated to northern hemisphere seasons, from January to December, and was dominated by horses from Europe, the US and Japan.
There was also a substantial early learning curve for forming the twin hemispheres.
Ink Publishing, which is headquartered in London with offices in New York, Hong Kong, Singapore and Atlanta, will produce its first issue of Hemispheres with the March 2009 issue.
Prof Davies said the difference between the players' muscle fibres and the difference between players from both hemispheres does not impact in all positions, and that forwards - players most likely to be involved in scrummages - are less likely to be at a disadvantage when challenged by the strongest players in rugby, as the pooled strength of scrums is likely to balance out.
The aim of this work was study different measures between right and left brain hemispheres, related in previous studies, comparing 40 cadaveric brains, with follow results:
Regardless of philosophical differences, Feinberg notes, evidence suggests that the brain's right hemisphere often orchestrates basic knowledge about one's self, just as the left hemisphere usually assumes primary responsibility for language.
I don't think there is any big difference between the hemispheres - Australia have struggled on this tour and have lost a couple of games.