Brain: Metencephalon Diagram depicting the main subdivisions of the embryonic vertebrate brain. These regions will later differentiate into forebrain, midbrain and hindbrain structures. Pons and cerebellum. Gray's subject #187 785 NeuroNames hier-534 MeSH Metencephalon NeuroLex ID birnlex_965
The metencephalon is a developmental categorization of portions of the central nervous system. The metencephalon is composed of the pons and the cerebellum; contains a portion of the fourth ventricle; and the trigeminal nerve (CN V), abducens nerve (CN VI), facial nerve (CN VII), and a portion of the vestibulocochlear nerve (CN VIII).
The metencephalon develops from the higher/rostral half of the embryonic rhombencephalon, and is differentiated from the myelencephalon in the embryo by approximately 5 weeks of age. By the third month, the metencephalon differentiates into its two main structures, the pons and the cerebellum.
The pons regulates breathing through particular nuclei that regulate the breathing center of the medulla oblongata. The cerebellum works to coordinate muscle movements, maintain posture, and integrate sensory information from the inner ear and proprioceptors in the muscles and joints.
Human brain, rhombencephalon, metencephalon: pons (TA A14.1.05.101–604, GA 9.785) Dorsal/
(tegmentum)SurfaceWhite: Sensory/ascendingWhite: Motor/descendingOther grey
(base)White: Motor/descendingSurfaceBasilar sulcus
Other grey: Raphe/
Human brain, rhombencephalon, metencephalon: cerebellum (TA 14.1.07, GA 9.788) Surface anatomyLobesMedial/lateral Grey matter White matterInternalPeduncles Ventricular system, rhombencephalon, met- and myel-: fourth ventricle (TA A14.1.05.701–726, GA 9.797) Roof (dorsal) Floor/rhomboid fossa (ventral) Apertures OtherTela chorioidea of fourth ventricle · Fastigium
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