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Encyclopedia > Myelencephalon

The myelencephalon is a developmental categorization of a portion of the central nervous system. The myelencephalon is composed of the medulla; contains a portion of the fourth ventricle; as well as 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). Morphogenesis (from the Greek morphê shape and genesis creation) is one of three fundamental aspects of developmental biology along with the control of cell growth and cellular differentiation. ... The vertebrate central nervous system consists of the brain and spinal cord. ... Medulla can refer to: The medulla oblongata, a part of the brainstem Medulla, Florida, a U.S. city The 2004 music album Medúlla by Icelandic singer Björk. ... The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. ... The glossopharyngeal nerve is the ninth of twelve cranial nerves. ... The vagus nerve is tenth of twelve cranial nerves and the only nerve that starts in the brainstem (somewhere in the medulla oblongata) and extends way down past the head, all the way down to the abdomen. ... The accessory nerve is the eleventh of twelve cranial nerves. ... The hypoglossal nerve is the twelfth cranial nerve. ... The vestibulocochlear nerve is the eighth of twelve cranial nerves, and also known as the auditory nerve. ...


  Results from FactBites:
 
Gray, Henry. 1918. Anatomy of the Human Body. Page 738 (265 words)
It is customary to divide the rest of the hind-brain into two parts, viz., an upper, called the metencephalon, and a lower, the myelencephalon.
The cerebellum is developed by a thickening of the roof, and the pons by a thickening in the floor and lateral walls of the metencephalon.
The floor and lateral walls of the myelencephalon are thickened to form the medulla oblongata; its roof remains thin, and, retaining to
72 Hour Chick Serial Cross Section: Photograph Descriptions (3502 words)
At this level of sectioning, both the lateral walls (upper portion of section) and the roof (lower portion of photograph) are visible.
The spinal cord, myelencephalon, and metencephalon are visible in this section.
Between the spinal cord and the myelencephalon two portions of the notochord are evident.
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