What are the components of the cns? what is the function of each?

Two main component of Central nervous system are brain and spinal cord.

Brain:

Brain acts as the main coordinating center of the body. The brain is protected in the skull. The brains control the emotions, thought process and learning memory of the organism. The brain interprets the information received by the five different sense organs.

Spinal cord:

The spinal cord is involved in the reflex action of the body. Spinal cord is involved in the somatosensory organization of the body. The motor pathways are originated from the spinal cord. Body's proprioceptive information travels through the spinal cord.

the endomembrane system i think