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Limbic System

Limbic System Definition Limbic System is a group of interconnected structures of the brain including the hypothalamus, amydala, and hippocampus that are located beneath the cortex, are common to all mammals, and are associated with emotions such as fear and pleasure, memory, motivation, and vari.....

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About Radio Frequency

About Radio Frequency Definition Radio Frequency (RF) is a frequency or band of frequencies that lie in the range 10 kilohertz to 300 000 megahertz and can be used for radio communications and broadcasting. It is a measurement representing the oscillation rate of electromagnetic radiation spectru.....

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Aluminium Oxide

Aluminium Oxide Definition Aluminium oxide is a white or colourless insoluble powder occurring naturally as corundum and used in the production of aluminium and its compounds, abrasives, glass, and ceramics. It is an oxide of aluminum, occurring in nature as various minerals such as bauxite, coru.....

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Anterior Pituitary

Anterior Pituitary Definition Anterior pituitary is a gland at the base of the brain in vertebrate animals that is divided into two regions, anterior and posterior, each of which secretes important hormones. Hormones secreted by the anterior pituitary influence growth, sexual development, skin pi.....

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Zinc Oxide

Zinc Oxide Definition Zinc oxide is a white powder, ZnO, which used as a pigment and in cosmetics, dental cement, matches, printing inks, and glass, and in medicine for treatment of skin conditions. It is a dry nanoparticle acting as filler. Solves typical problems for surface finishing like corr.....

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About Radio Astronomy

About Radio Astronomy Definition Radio astronomy is the study of celestial objects by measurement of the radio waves they emit. It has enabled the detection and study of objects such as pulsars, quasars, radio galaxies, and other objects, some of which emit considerably less radiation at other wa.....

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Hyperprolactinemia

Hyperprolactinemia Definition Hyperprolactinemia (or Hyperprolactinaemia) is elevated levels of prolactin in the blood; which is a normal physiologic reaction during lactation, but pathologic otherwise; often due to physical or emotional stress or rapid weight loss, sometimes to pituitary adenoma.....

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Ionic Compound

Ionic Compound Definition Ionic compound is a compound formed by ions bonding together through electrostatic forces. Ionic compounds are also known as electrically neutral compounds: that is the number of positively charged ions and the number of negatively charged ions or electrons is equal. The.....

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Sella Turcica

Sella Turcica Definition Sella Turcica is a bony cavity housing the pituitary gland, which is located in the brain and responsible for secreting a number of hormones. It serves as a cephalometric landmark. It includes the tuberculum sellae anteriorly and the dorsum sellae posteriorly; with its co.....

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Sunspot

Sunspot Definition Sunspots are easily recognized as speckles on the surface of the sun. Sunspots appear dark because they are cooler, by up to 1,500°K, than the surrounding photosphere. They are associated with strong magnetic fields and solar magnetic storms moving in a vortex pattern, similar.....

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Sodium Hydroxide

Sodium Hydroxide Definition Sodium hydroxide is toxic and strongly alkaline and is used to make chemicals and soaps and to refine petroleum. It is a white, corrosive, solid compound that absorbs water and carbon dioxide from the atmosphere and forms lye when in solution. It is a highly caustic ba.....

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Sphenoid Bone

Sphenoid Bone Definition Sphenoid bone is the large butterfly-shaped compound bone at the base of the skull, which containing a protective depression for the pituitary gland. The sphenoid bone has been called the ‘keystone’ of the cranial floor because it is in contact with all of the.....

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