Origin: neuroectoderm: neural crest and neural tube.
- Central nervous system lies deep in the body, surrounded and protected by bone. It
consists of the brain, which is incased by the skull,
and the spinal cord, which extends down the canal of the
- Peripheral nervous system consists of the three components: ganglia, nerves, and nerve endings or organs of special sense: smell, taste,
sight, hearing, and position of the body in relation to gravity.