α. 1800s– metencephalon.
β. 1800s metencephal.
metencephalonn.
/ˌmɛtɛnˈsɛfəlɒn/, U.S. /ˌmɛdənˈsɛfəl(ə)n/; see also encephalon n. Anatomy and Zoology.† 1. The posterior division of the hindbrain, giving rise to the medulla oblongata, fourth ventricle, and auditory nerve; = myelencephalon n. 2. Obsolete.
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the world > life > the body > nervous system > cerebrospinal axis > brain > parts of brain > [noun] > regions of brain
mesencephal1839
mesocephale1839
mesencephalon1846
prosencephalon1846
mesocephalon1857
midbrain1864
metencephalon1867
brain mantle1874
thalamencephalon1875
procerebrum1884
metepencephalon1885
thalamencephal1891
telencephalon1893
rhombencephalon1895
pretectum1961
1867 Quain's Elements Anat. (ed. 7) II. 577 Metencephalon. Medulla Oblongata, Fourth Ventricle, Auditory nerve.
1882 B. G. Wilder & S. H. Gage Anat. Technol. Domest. Cat 419 Note the lateral expansion of the myelon to form the metencephalon (medulla).
1889 B. G. Wilder in Buck's Handbk. Med. Sc. VIII. 128/1 A caudal [pair] (postpeduncles) to the metencephal and myel.
1890 New Sydenham Soc. Lexicon Metencephalon, Wilder's term for the after-brain, being the posterior division of the third, or posterior primary, cerebral vesicle. It corresponds with the medulla oblongata, the fourth ventricle, and the auditory nerve. It is the Myelencephalon of Huxley.
2. The anterior division of the rhombencephalon (hindbrain) in the vertebrate embryo. Also: the pons and cerebellum, into which this develops.
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the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > skull or brain
visceral cleft1870
metencephalon1871
chondrocranium1875
protocerebrum1885
protencephalon1887
parachordal1892
tritencephalon1910
parencephalon1911
1871 T. H. Huxley Man. Anat. Vertebrated Animals ii. 60 The hind-brain differs from the posterior cerebral vesicle in being differentiated into the medulla oblongata (or myelencephalon) behind, and the cerebellum with the pons varoli (which together constitute the metencephalon) in front.
1899 B. G. Wilder in Science 21 Apr. 573/1 I am compelled to regard the transference of metencephalon from the ultimate segment to the penultimate..as constituting a violation of scientific ethics that merits the severest reprobation.
1934 R. R. Grinker Neurol. i. 12 Division of the rhombencephalon into metencephalon (cerebellum) and myelencephalon (medulla).
1965 L. B. Arey Developmental Anat. (ed. 7) xxv. 473 Somewhat later the hind-brain specializes into the metencephalon, or future region of cerebellum and pons, and the myelencephalon, or medulla oblongata.
1986 A. S. Romer & T. S. Parsons Vertebr. Body (ed. 6) xvi. 570 Pons and overlying cerebellum are distinguished as the metencephalon from the more posterior part of the medulla, the myelencephalon.
1998 Virology 252 318 Spongiform lesions are most severe in the metencephalon and mesencephalon but extend into the prosencephalon and spinal cord.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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