The brain develops from which of the following embryonic germ layers?

The self-governing nervous system is known as:

Which system in mammals develops from the ectoderm?

The autonomic nervous system consists of:

Select the correct option:
$(1)$ The cell body contains typical cell organelles and Nissl's granules / neurotransmitters.
$(2)$ The nervous system of Hydra is composed of a nerve net / ganglia.

Describe briefly the types of neural system in humans.