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Development of the cranial nuclei. A–D. Schematic section through the hind brain at three developmental time points (A–C) and maturity (D). The space within the sections is the fourth ventricle. During development the fourth ventricle, initially flattened dorsoventrally just like the spinal cord, expands dorsally. This has the effect of transforming the dorsoventral sensory-motor nuclear organization characteristic of the spinal cord, into the lateromedial organization of sensory and motor nuclei in the caudal brain stem (the future medulla and pons). Developing neurons in the alar plate will become sensory cranial nuclei near the ventricular floor and, in the basal plate, cranial motor nuclei. Additionally, neurons from the plates migrate to more distant locations to serve more integrative functions. Source: Cranial Nerve Motor Nuclei and Brain Stem Motor Functions, Neuroanatomy Text and Atlas, 4e Citation: Martin JH. Neuroanatomy Text and Atlas, 4e; 2016 Available at: http://mhmedical.com/ Accessed: May 05, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
