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Chapter: Human Nervous System and Sensory Organs : Brain Stem and Cranial Nerves
Longitudinal Organization of Brain Stem and Cranial Nerves
The longitudinal organization of the neuraltube (A1) can still be recognized in the brainstem. However, it is modified through the widening of the central canal into the fourth ventricle (A2, A3).
Longitudinal Organization
The
longitudinal organization of the neuraltube
(A1) can still be recognized in
the brainstem. However, it is modified through the widening of the central
canal into the fourth ventricle (A2,
A3).
The
dorsoventral arrangement of motor basal
plate (A4), visceromotor (A5) andviscerosensory (A6) regions, and sensory alar plate (A7) changes to a mediolateral ar-rangement on the floor of the
rhomboid fossa when the neural tube unfolds (A2). The somatomotor zone
lies medially, next comes the visceromotor
zone; the viscerosensory and somatosensory zones aretransposed
laterally. The cranial nerve nu-clei in the medulla oblongata are arranged
according to this blueprint (A3).
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Human Nervous System and Sensory Organs : Brain Stem and Cranial Nerves : Longitudinal Organization of Brain Stem and Cranial Nerves |
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Human Nervous System and Sensory Organs : Brain Stem and Cranial Nerves