State the functions of the following:

(a) Association neuron

(b) Myelin sheath

(c) Medullary sheath

(d) Cerebrospinal fluid

Rearrange the following in correct sequence pertaining to what is given within brackets at the end.

(a) Effector — Sensory neuron — Receptor — Motor neuron — Stimulus — Central nervous system — Response (Reflex arc)

(b) Repolarization — Depolarization — Resting (polarsied) (during conduction of nerve impulse through a nerve fibre)

(c) Axon endings — Dendrites — Axon — Perikaryon — Dendron (Neuron structure)

(d) Diencephalon — Cerebellum — Medulla oblongata — Pons — Cerebrum — mid brain (sequence of parts of human brain).

Name three types of nerves.

Name three main parts of the neuron.