mesencephalon


mesencephalon
That part of the brainstem developing from the middle of the three primary cerebral vesicles of the embryo (the caudal of these being the rhombencephalon or hindbrain, the rostral the prosencephalon or forebrain). In the adult, the m. is characterized by the unique conformation of its roof plate, the lamina tecti (tectal plate [TA] or quadrigeminal plate [TAalt]. composed of the bilaterally paired superior and inferior colliculus, and by the massive paired prominence of the crus cerebri at its ventral surface. On transverse section, its patent central canal, the cerebral aqueduct, is surrounded by a prominent ring of gray matter poor in myelinated fibers; the periaqueductal gray is ventrally and laterally adjoined by the myelin-rich mesencephalic tegmentum, and covered dorsally by the mesencephalic tectal plate. Prominent cell groups of the m. include the motor nuclei of the trochlear and oculomotor nerves, the red nucleus, and the substantia nigra. SYN: midbrain vesicle, midbrain. [mes- + G. enkephalos, brain]

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mes·en·ceph·a·lon .mez-.en-'sef-ə-.län, .mez-ən-, .mēz-, .mēs-, .mes-, -lən n MIDBRAIN

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n.

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mes·en·ceph·a·lon (mez″en-sefґə-lon) [meso- + encephalon] 1. [TA] the part of the brain developed from 2. the middle of the three primary vesicles of the embryonic neural tube; it comprises the tectum, midbrain tegmentum, and basis pedunculi; see Plate 9. See also brainstem. the middle of the three primary brain vesicles in the embryo, lying between the prosencephalon and the rhombencephalon. Called also midbrain.

Medical dictionary. 2011.

Look at other dictionaries:

  • Mesencephalon — Mes en*ceph a*lon, n. [NL. See {Meso } and {Encephalon}.] (Anat.) The middle segment of the brain; the midbrain. Sometimes abbreviated to {mesen}. See {Brain}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Mesencephălon — (griech.), das Mittelgehirn …   Meyers Großes Konversations-Lexikon

  • Mesencephalon — ⇒ Mittelhirn …   Deutsch wörterbuch der biologie

  • MESENCEPHALON — MESENCEPHALON, средний мозг, один из отделов (третий) головного мозга; в состав его входит мозговая ножка и четверохолмие; лежит между dienccphalon и isthmus cerebri. Развивается из среднего мозгового пузыря, полость к рого, сужаясь, превращается …   Большая медицинская энциклопедия

  • mesencephalon — [mes΄en sef′ə län΄, mez΄en sef′ə län΄] n. pl. mesencephala [mes΄en sef΄ələ] [ModL: see MESO & ENCEPHALON] MIDBRAIN mesencephalic [mes΄ensə fal′ik, mez΄ensə fal′ik] adj …   English World dictionary

  • Mesencephalon — Infobox Brain Name = Mesencephalon Latin = mesencephalon GraySubject = 188 GrayPage = 800 Caption = Inferior view mesencephalon (2), above (3) Caption2 = Human brainstem mesencephalon (B) IsPartOf = Components = Artery = Vein = BrainInfoType =… …   Wikipedia

  • Mesencephalon — Lage des Mittelhirns (3), frontaler Schnitt Das Mittelhirn (lat. Mesencephalon) ist ein Teil des Hirnstamms und liegt zwischen Brücke (Pons) und Zwischenhirn (Diencephalon). Das Mittelhirn steuert die meisten Augenmuskeln und ist ein wichtiger… …   Deutsch Wikipedia

  • mesencephalon — the midbrain, one of three regions that develop in the fish brain. Unlike the forebrain and the hindbrain, the mesencephalon remains undivided. Details of the brain structure of a fish (Danio rero) may be found in Wullimann et al. (1996). See… …   Dictionary of ichthyology

  • Mesencephalon — vidurinės smegenys statusas T sritis centrinė nervų sistema atitikmenys: lot. Mesencephalon ryšiai: platesnis terminas – centrinė nervų sistema siauresnis terminas – dangtinė jungtis siauresnis terminas – dangtinė vidurinių smegenų plokštelė… …   Paukščių anatomijos terminai

  • Mesencephalon — vidurinės smegenys statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Mesencephalon ryšiai: platesnis terminas – ventralinė tilto dalis …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Mesencephalon — vidurinės smegenys statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Mesencephalon ryšiai: platesnis terminas – nervų sistema siauresnis terminas – galvinis linkis siauresnis terminas – vidurinių smegenų ertmė …   Veterinarinės anatomijos, histologijos ir embriologijos terminai


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