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Related to Cerebral hemispheres: diencephalon, limbic system


1. one half of a sphere
a. half of the terrestrial globe, divided into northern and southern hemispheres by the equator or into eastern and western hemispheres by some meridians, usually 0° and 180°
b. a map or projection of one of the hemispheres
3. either of the two halves of the celestial sphere that lie north or south of the celestial equator
4. Anatomy short for cerebral hemisphere


(religion, spiritualism, and occult)

Hemisphere literally means a half sphere. In geography, hemisphere refers to the division of Earth into northern, southern, eastern, and western hemispheres. In astrology, hemisphere usually refers to the division of a horoscope into upper and lower halves (using the ascendant-descendant axis as the dividing line) or into left and right halves (using the midheaven-imum coeli axis as the dividing line). The upper and lower hemispheres of a chart are technically termed the diurnal (day, because it is above the horizon) arc and the nocturnal (night, because it is below the horizon) arc, respectively. The left and right hemispheres are termed the oriental (eastern) arc and the occidental (western) arc. These technical terms are rarely used by contemporary astrologers.

In the interpretation of a natal chart, the occurence of many planets above the horizon is said to indicate extroversion; many planets below the horizon indicates introversion. Also, a chart with a preponderance of planets in the left hemisphere is said to indicate an individual who shapes her or his environment, and a preponderance in the right hemisphere indicates an individual who adapts to the environment. These interpretations are tentative, “first impression” delineations and can be quickly abandoned if other factors in a birth chart give contrary indications.


Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New York: New American Library, 1980.
Gettings, Fred. Dictionary of Astrology. London: Routledge & Kegan Paul, 1985.


A half of the earth divided into north and south sections by the equator, or into an east section containing Europe, Asia, and Africa, and a west section containing the Americas.
One of the two pieces of a sphere divided by a great circle.
References in periodicals archive ?
These EtOH-induced decreases in long-chain/short membrane fatty acids and unsaturated/saturated membrane fatty acids correlate with EtOH-induced reductions in brain neuron densities within the cerebral hemispheres and optic lobes and increased levels of brain lipid hydroperoxides.
In the small body of parapsychological literature that has examined this question, most of the studies have explored how functional differences of the cerebral hemispheres might interact with psi abilities.
This groove rounds into a tube that subsequently divides into a paired set of cerebral hemispheres and an unpaired brainstem.
Whereas in earlier times the explanation was sought in the uncontrollable motions of the uterus, a chronic imbalance between bodily fluids or weak nerves, [2] nowadays all this is translated into a biochemical and evolutionary jargon that explains the origins of "natural" differences of psyche and behavior between the sexes in terms of the sex-specific workings of hormones and the structure of the cerebral hemispheres.
This part of the brain, tucked under the cerebral hemispheres, is where many of the cranial nerves originate, including the trigeminal nerves, which are the source of sensation to the face.
One part of this network lies near the front of the brain, adjacent to the bundle of nerve fibers that connects the cerebral hemispheres, a new study finds.
The book closes with two less well-developed chapters that could be described as a discussion of the issues surrounding the relative importance of the cerebral hemispheres, and of music and affect.
The main behavioral difference described between normal newborns and those without cerebral hemispheres, whether due to anencephaly or hydranencephaly (in utero destruction of both cerebral hemispheres, with intact skull and scalp), is increased irritability and lack of habituation to repeated stimuli, [32] although even these differences are not universally observed among infants lacking forebrains.
The book also includes an enlightening DVD describing the basic surface anatomy of the cerebral hemispheres, coronal and horizontal sections, and blunt dissection of the forebrain with special attention to clinical-anatomical correlations of interest to psychiatrists.
Poorly defined, bilaterally symmetrical T2, PD, and FLAIR hyperintensity was seen ventrally throughout both cerebral hemispheres and was thought to represent either a variation of normal, or possibly edema.
These foci can vary from millimetres to centimetres in size and can occur anywhere, but are frequently found in the cerebral hemispheres and, less commonly, in the cerebellum, brain stem and spinal cord.
Hamartomas in the cerebral hemispheres consist of bizarre giant cells, fibrillary gliosis and disordered myelin.