Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The posterior portion of the embryonic hindbrain, from which the medulla oblongata develops.
- noun The medulla oblongata of the adult brain.
from The Century Dictionary.
- noun The cerebrospinal axis; the brain and spinal cord taken together and considered as a whole.
- noun The hindmost segment of the encephalon; the afterbrain or metencephalon, more commonly called the medulla oblongata. See cuts under
encephalon and brain. Huxley.
from the GNU version of the Collaborative International Dictionary of English.
- noun The brain and spinal cord; the cerebro-spinal axis. Sometimes abbreviated to
myelencephal . - noun The metencephalon.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun neuroanatomy The portion of the
brain composed of themedulla oblongata .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the posterior part of the hindbrain in developing vertebrates; forms the medulla oblongata in adults
Etymologies
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Examples
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It is customary to divide the rest of the hind-brain into two parts, viz., an upper, called the metencephalon, and a lower, the myelencephalon.
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On transverse section the myelencephalon at an early stage is seen to consist of two lateral walls, connected across the middle line by floor - and roof-plates (Figs. 647 and 648).
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The floor and lateral walls of the myelencephalon are thickened to form the medulla oblongata; its roof remains thin, and, retaining to a great extent its epithelial nature, is expanded in a lateral direction.
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Developmentally considered, the fourth ventricle consists of three parts: a superior belonging to the isthmus rhombencephali, an intermediate, to the metencephalon, and an inferior, to the myelencephalon.
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It consists of (a) the myelencephalon, comprising the medulla oblongata and the lower part of the fourth ventricle; (b) the metencephalon, consisting of the pons, cerebellum, and the intermediate part of the fourth ventricle; and (c) the isthmus rhombencephali, a constricted portion immediately adjoining the mid-brain and including the superior peduncles of the cerebellum, the anterior medullary velum, and the upper part of the fourth ventricle.
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