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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 ?
Neurosurgical management of low-grade astrocytoma of the cerebral hemispheres. J Neurosurg 1984; 61: 665-73.
High incidence of infarction in the left cerebral hemisphere among young adults.
For example, neural networks capable of self-sustaining oscillation, known as central pattern generators (CPGs), contribute to the locomotion of several species, and coordinated rhythmic locomotion is preserved even after the cerebral hemispheres of the brain are surgically disconnected.
Primary motor cortex area of one of the cerebral hemispheres includes cortical nerve centers which controls all muscles or muscle groups belonging to contralateral side of the body.
The characteristic signs suggestive of ACC are: moderate distension of the occipital ventricle and the ventricular communications; absence of the spectrum giving rise to an upward displacement of the third ventricle shown in the anterior coronal section (especially in transvaginal ultrasonography); radial position of the fissures on the internal side of the cerebral hemisphere seen on the sagittal section; the absence in color coded Doppler of the pericallosal artery normally characterized by a semicircular vessel observable on the median sagittal section.
Integration between the visual hemifields implies integration between the cerebral hemispheres, since each visual hemifield projects to the opposite cerebral hemisphere.
Holoprosencephaly occurs due to failure of proliferation of cerebral tissue to form 2 separate cerebral hemispheres. Normally, the right and left cerebral hemispheres form independently in a unified process of neuronal proliferation.
Among much else, she describes the dualistic working of the normal brain, which is divided into two cerebral hemispheres. Normally they are closely linked, yet have different functions.
Some mass effect on the cerebral hemispheres and compression of the lateral ventricles was also seen.
* The cerebral hemispheres accounts for 85 percent of the brain's weight.
MRI revealed that the arachnoid cyst went across the midline of the brain and elevated both cerebral hemispheres, "but it clearly did not communicate with the ventricles."
The study, reported in the journal Neuropsychology, supports the theory that people with a head for maths are better at relaying information between the cerebral hemispheres.