The mesencephalon is the primary vesicle of the embryonic nervous system does not differentiate into more vesicles at the secondary stage.
It refers to the region of the developing vertebrate brain that is composed of the tectum and tegmentum. The midbrain serves an important functions in motor movement, particularly movements of the eye, and in auditory and visual processing.
However, the mesencephalon is the primary vesicle of the embryonic nervous system does not differentiate into more vesicles at the secondary stage.
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