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Medulla   /mɪdˈələ/  /mɪdˈulə/   Listen

(pl. medullae, medullas)
A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers.  Synonyms: myelin, myeline.
Lower or hindmost part of the brain; continuous with spinal cord; ('bulb' is an old term for medulla oblongata).  Synonyms: bulb, medulla oblongata.
The inner part of an organ or structure in plant or animal.

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"Medulla" Quotes from Famous Books

... channels. In these cases, therefore, reflex action must be effected through the brain, all the nerves involved being cerebral. 'When the whole body starts at a loud noise, the afferent auditory nerve gives rise to an impulse which passes to the medulla oblongata, and thence affects the great majority of the motor nerves of the body. 'It may be said that these are mere mechanical actions, and have nothing to do with the acts which we associate with intelligence. But let us ...
— Physics and Politics, or, Thoughts on the application of the principles of "natural selection" and "inheritance" to political society • Walter Bagehot

... multiplier of SCHWEIGHER with a magnetic needle, that the electro-magnetic rotation could be readily produced; at least so far as to effect small vibrations backwards and forwards. On repeating it with two needles, one of them run into an artery and another into a vein, or one into the medulla spinalis, at the neck, and another into an extremity, in a rabbit, no effect whatever took place.—Magendie's ...
— North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826 • Various

... he will lose the prayer of acquired quiet, because he voluntarily abandons it before the time; and will not attain to the prayer of infused quiet, because he attempts to rise into it before he is called (Francis. de Sancto Thoma, Medulla Mystica, tr. iv. ch. ...
— The Life of St. Teresa of Jesus • Teresa of Avila

Words linked to "Medulla" :   respiratory center, myelin sheath, brain stem, medullary sheath, neural structure, brain-stem, brainstem, plant tissue, fat, cortex, animal tissue

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