Difference between revisions of "The Brain"
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| − | Enclosed within the skull is the central organ of the nervous system--the '''brain'''. There are "three major divisions of the brain: the forebrain, the midbrain, and the hindbrain." | + | Enclosed within the skull is the central organ of the nervous system--the '''brain'''. There are "three major divisions of the brain: the '''forebrain''', the '''midbrain''', and the '''hindbrain'''." |
[pg. 324, '''WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition'''] | [pg. 324, '''WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition'''] | ||
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==Grey Matter== | ==Grey Matter== | ||
| − | The grey matter of the brain is "made up largely of nerve cells". | + | The grey matter of the brain is "made up largely of '''nerve cells'''". |
[pg. 324, '''WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition'''] | [pg. 324, '''WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition'''] | ||
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==White Matter== | ==White Matter== | ||
| − | The white matter of the brain is "made up chiefly of nerve | + | The white matter of the brain is "made up chiefly of '''nerve fibres''' arising from the nerve cells of the brain". |
[pg. 324, '''WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition'''] | [pg. 324, '''WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition'''] | ||
Revision as of 22:55, 16 August 2006
Enclosed within the skull is the central organ of the nervous system--the brain. There are "three major divisions of the brain: the forebrain, the midbrain, and the hindbrain."
[pg. 324, WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition]
The appearance of the brain is made up of both grey and white matter that can be "divided into several parts". At first glance, the surface of brain is made up of grey matter and forms what is "convolutions of the cerebrum, and the laminae of the cerebellum"...."grey matter is found in the interior of the brain, collected into large and distinct masses or ganglionic bodies, such as the corpus striatum, optic thalamus, and corpora quadrigemina." Under this first layer, the "...grey matter is found intermingled intimately with the white, but without definite arrangement..." And in the third layer "the white matter of the brain is divisible into three distinct classes of fibres: diverging, comissural, and associations fibres."
[pg. 47, GRAY'S ANATOMY by Henry Gray F.R.S (c) 1995, 15th Edition]
Grey Matter
The grey matter of the brain is "made up largely of nerve cells".
[pg. 324, WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition]
White Matter
The white matter of the brain is "made up chiefly of nerve fibres arising from the nerve cells of the brain".
[pg. 324, WEBSTER'S NEW INTERNATIONAL UNABRIDGED DICTIONARY (c) 1954, 2nd Edition]
