n.
The hindbrain.
rhombencephalic rhom'ben·ce·phal'ic (-sə-făl'ĭk) adj.
rhombencephalon
Dictionary:
rhom·ben·ceph·a·lon (rŏm'bĕn-sĕf'ə-lŏn', -lən)  |
| 5min Related Video: rhombencephalon |
| Medical Dictionary: rhom·ben·ceph·a·lon |
(rŏm'bĕn-sĕf'ə-lŏn', -lən)
n.
n.
The portion of the embryonic brain from which the metencephalon and myelencephalon develop, including the pons, cerebellum, and the medulla oblongata. Also called hindbrain.
| Veterinary Dictionary: rhombencephalon |
1. the hindbrain, including the medulla oblongata, pons and cerebellum.
2. the most caudal of the three primary vesicles formed in embryonic development of the brain, which later divides into the metencephalon and the myelencephalon.
| WordNet: rhombencephalon |
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
the posterior portion of the brain including cerebellum and pons and medulla oblongata
Synonym: hindbrain
| Wikipedia: Rhombencephalon |
| Brain: Rhombencephalon | ||
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| Diagram depicting the main subdivisions of the embryonic vertebrate brain. These regions will later differentiate into forebrain, midbrain and hindbrain structures. | ||
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| Scheme of roof of fourth ventricle. | ||
| Gray's | subject #187 767 | |
| NeuroNames | hier-531 | |
| MeSH | Rhombencephalon | |
| NeuroLex ID | birnlex_942 | |
The rhombencephalon (or hindbrain) is a developmental categorization of portions of the central nervous system in vertebrates.
The rhombencephalon can be subdivided in a variable number of transversal swellings called rhombomeres. In the human embryo we can distinguish eight rhombomeres, from caudal to rostral: Rh7-Rh1 and the isthmus (the most rostral rhombomere).
A rare disease of the rhombencephalon, "rhombencephalosynapsis" is characterized by a missing vermis resulting in a fused cerebellum. Patients generally present with cerebellar ataxia.
The caudal rhombencephalon has been generally considered as the initiation site for neural tube closure.[1]
Contents |
Myelencephalon
Rhombomeres Rh7-Rh4 form the myelencephalon.
The myelencephalon forms the medulla oblongata in the adult brain; it contains:
- a portion of the fourth ventricle,
- the glossopharyngeal nerve (CN IX),
- vagus nerve (CN X),
- accessory nerve (CN XI),
- hypoglossal nerve (CN XII),
- and a portion of the vestibulocochlear nerve (CN VIII).
Metencephalon
Rhombomeres Rh3-Rh1 form the metencephalon.
The metencephalon is composed of the pons and the cerebellum; it contains:
- a portion of the fourth ventricle,
- the trigeminal nerve (CN V),
- abducens nerve (CN VI),
- facial nerve (CN VII),
- and a portion of the vestibulocochlear nerve (CN VIII).
Additional images
 Chick embryo of thirty-three hours’ incubation, viewed from the dorsal aspect. X 30. |
 Embryo between eighteen and twenty-one days. |
References
External links
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 | metencephalon (embryology) |
| epichordal brain (embryology) |
| hindbrain |
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Read more |
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| Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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| WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Rhombencephalon". Read more |
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Mentioned in
- metencephalon (embryology)
- epichordal brain (embryology)
- hindbrain
- myelencephalon
