Rhombencephalon
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| Brain: Rhombencephalon | ||
|---|---|---|
| Diagram depicting the main subdivisions of the embryonic vertebrate brain. These regions will later differentiate into forebrain, midbrain and hindbrain structures. | ||
| Superficial dissection of brain-stem. Lateral view. | ||
| Gray's | subject #187 767 | |
| NeuroNames | hier-531 | |
| MeSH | A08.186.211.132.810 | |
| Dorlands/Elsevier | r_12/12709581 | |
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).
[edit] 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).
[edit] 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).
[edit] Additional images
Chick embryo of thirty-three hours’ incubation, viewed from the dorsal aspect. X 30. |
Embryo between eighteen and twenty-one days. |
 | This neuroscience article is a stub. You can help Wikipedia by expanding it. |
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