| 释义 |
midbrain
mid·brain M0279400 (mĭd′brān′)n. The portion of the vertebrate brain that develops from the middle section of the embryonic brain.midbrain (ˈmɪdˌbreɪn) n (Anatomy) the nontechnical name for mesencephalonmid•brain (ˈmɪdˌbreɪn)
n. the middle of the three primary divisions of the brain in the embryo of a vertebrate or the part of the adult brain derived from this tissue; mesencephalon. [1870–75] mid·brain (mĭd′brān′) The middle part of the brain in vertebrate animals. In most animals except mammals, the midbrain processes sensory information. In mammals, it serves mainly to connect the forebrain with the hindbrain. Compare forebrain, hindbrain.midbrain
The top of the brain stem, between the diencephalon and the pons. It is largely a relay station for sensory impulses.Thesaurus| Noun | 1. |  midbrain - the middle portion of the brain mesencephalonneural structure - a structure that is part of the nervous systembrain, encephalon - that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cordlocus niger, nucleus niger, substantia nigra - a layer of deeply pigmented grey matter in the midbrain; associated with the striate body; is involved in metabolic disturbances associated with Parkinson's disease and with Huntington's diseasesuperior colliculus - an essential visual center between the retina and the striate cortexinferior colliculus - an essential auditory center in the midbrain |
Translationsmidbrain
midbrain: see brainbrain,
the supervisory center of the nervous system in all vertebrates. It also serves as the site of emotions, memory, self-awareness, and thought. Anatomy and Function
..... Click the link for more information. .midbrain[′mid‚brān] (anatomy) Those portions of the adult brain derived from the embryonic midbrain. (embryology) The middle portion of the embryonic vertebrate brain. Also known as mesencephalon. midbrain
mesencephalon [mes″en-sef´ah-lon] 1. the short part of the brainstem just above the pons; it contains the nerve pathways between the cerebral hemispheres and the medulla oblongata, as well as nuclei (relay stations or centers) of the third and fourth cranial nerves. The center for visual reflexes, such as moving the head and eyes, is located here. The mesencephalon (midbrain). From Applegate, 2000.2. the middle of the three primary brain vesicles of the embryo; called also midbrain. adj., adj mesencephal´ic.mes·en·ceph·a·lon (mes-en-sef'ă-lon), [TA] 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 mesencephalon 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 anterolateral (ventrolateral) 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 adjoined by the myelin-rich mesencephalic tegmentum, and covered posteriorly (dorsally) by the mesencephalic tectal plate. Prominent cell groups of the mesencephalon include the motor nuclei of the trochlear and oculomotor nerves, the red nucleus, and the substantia nigra. Synonym(s): midbrain vesicle ☆ , midbrain ☆ [mes- + G. enkephalos, brain] midbrain The part of the brain stem located below the cerebral cortex (joining the diencephalon (thalamus and hypothalamus)) and above the hindbrain (arising from the pons/metencephalon).
Components
Tectum/corpora quadrigemina, tegmentum, cerebral aqueduct, cerebral peduncles, substantia nigra, various nuclei and fasciculi.
Functions
Associated with motor pathways via the basal ganglia; motivation and habituation via dopaminergic pathways via substantia nigra; helps relay information for vision and hearing.mes·en·ceph·a·lon (mes'en-sef'ă-lon) [TA]That part of the brainstem developing from the middle of the three primary cerebral vesicles of the embryo. In an adult, the mesencephalon is characterized by the unique conformation of its roof plate, the lamina of the mesencephalic tectum, composed of the bilaterally paired superior and inferior colliculi, and by the massive paired prominence of the crus cerebri at its ventral surface. Prominent cell groups of the mesencephalon include the motor nuclei of the trochlear and oculomotor nerves, the red nucleus, and the substantia nigra.
Synonym(s): midbrain. [G. mes- middle + G. enkephalos, brain]midbrain or mesencephalon that part of the brain lying between the forebrain and hindbrain. It contains the optic lobe and is particularly concerned with hearing and sight. see FOREBRAIN, HINDBRAIN.mes·en·ceph·a·lon (mes'en-sef'ă-lon) [TA]That part of the brainstem developing from the middle of the three primary cerebral vesicles of the embryo. In an adult, the mesencephalon is characterized by the unique conformation of its roof plate, the lamina of the mesencephalic tectum, composed of the bilaterally paired superior and inferior colliculi, and by the massive paired prominence of the crus cerebri at its ventral surface.
Synonym(s): midbrain. [G. mes- middle + G. enkephalos, brain]midbrain
Related to midbrain: Midbrain tegmentumSynonyms for midbrainnoun the middle portion of the brainSynonymsRelated Words- neural structure
- brain
- encephalon
- locus niger
- nucleus niger
- substantia nigra
- superior colliculus
- inferior colliculus
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