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myelencephalon
my·e·len·ceph·a·lon M0508000 (mī′ə-lĕn-sĕf′ə-lŏn′)n.1. The posterior portion of the embryonic hindbrain, from which the medulla oblongata develops.2. The medulla oblongata of the adult brain.
my′e·len·ce·phal′ic (-sə-făl′ĭk) adj.myelencephalon (ˌmaɪɪlɛnˈsɛfəˌlɒn) n, pl -lons or -la (-lə) (Biology) the part of the embryonic hindbrain that develops into the medulla oblongata. Nontechnical name: afterbrain myelencephalic adjmy•el•en•ceph•a•lon (ˌmaɪ ə lɛnˈsɛf əˌlɒn)
n., pl. -lons, -la (-lə). the posterior section of the hindbrain, which develops into the medulla oblongata. [1835–45] my`el•en`ce•phal′ic (-səˈfæl ɪk) adj. Thesaurus| Noun | 1. | myelencephalon - the posterior part of the hindbrain in developing vertebrates; forms the medulla oblongata in adultsneural structure - a structure that is part of the nervous systemhindbrain, rhombencephalon - the posterior portion of the brain including cerebellum and brainstem |
myelencephalon
myelencephalon[‚mī·ə·lən′sef·ə‚län] (embryology) The caudal portion of the hindbrain; gives rise to the medulla oblongata. myelencephalon
myelencephalon [mi″el-en-sef´ah-lon] 1. the posterior part of the rhombencephalon" >rhombencephalon, comprising the medulla oblongata and lower part of the fourth ventricle.2. the posterior of the two brain vesicles formed by specialization of the rhombencephalon in the developing embryo.me·dul·la ob·lon·ga·'ta [TA] the most caudal subdivision of the brainstem, immediately continuous with the spinal cord, extending from the lower border of the decussation of the pyramid to the pons; its anterior (ventral) surface resembles that of the spinal cord except for the bilateral prominence of the inferior olive; the posterior (dorsal) surface of its upper half forms part of the floor of the fourth ventricle. Motor nuclei of the medulla oblongata include the hypoglossal nucleus, the dorsal motor nucleus, inferior salivatory nucleus, and the nucleus ambiguus; sensory nuclei include the nuclei of the posterior column (gracile and cuneate), the cochlear and vestibular nuclei, the middle and caudal portions of the spinal trigeminal nucleus, and the nucleus of the solitary tract.
See also: medulla. Synonym(s): myelencephalon [TA], oblongatamyelencephalon (mī′ə-lĕn-sĕf′ə-lŏn′)n.1. The posterior portion of the embryonic hindbrain, from which the medulla oblongata develops.2. The medulla oblongata of the adult brain.
my′e·len·ce·phal′ic (-sə-făl′ĭk) adj.myelencephalon The posterior part of the hindbrain (rhombencephalon) in the embryo, which differentiates into the medulla oblongata, the caudal end of the fourth ventricle and cranial nerves 8 to 12.me·dul·la ob·lon·ga·ta (mĕ-dŭl'ă ob-long-gā'tă) [TA] The most caudal subdivision of the brainstem, continuous with the spinal cord, extending from the lower border of the decussation of the pyramid to the pons; its ventral surface resembles that of the spinal cord except for the bilateral prominence of the inferior olive; the dorsal surface of its upper half forms part of the floor of the fourth ventricle. Motor nucleiof the medulla oblongata include the hypoglossal nucleus, the dorsal motor nucleus, inferior salivatory nucleus, and the nucleus ambiguus; sensory nuclei include the nuclei of the posterior column (gracile and cuneate), the cochlear and vestibular nuclei, the mid and caudal portions of the spinal trigeminal nucleus, and the nucleus of the solitary tract.
See also: medulla
Synonym(s): myelencephalon, oblongata. myelencephalon
Words related to myelencephalonnoun the posterior part of the hindbrain in developing vertebratesRelated Words- neural structure
- hindbrain
- rhombencephalon
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