Central Neural System

Peripheral Neural System

1. Central neural system is the main coordinating centre of the body.

1. Peripheral neural system is not the main coordinating centre of the body.

2. It includes brain and spinal cord.

2. It includes cranial and spinal nerves that connect central nervous system to different parts of the body.

Resting Potential

Action Potential

1. Resting potential is the potential difference across the nerve fibre when there is no conduction of nerve impulse.

2. Action potential is the potential difference across nerve fibre when there is conduction of nerve impulse.

2. The membrane is more permeable to K+ ions than to Na+ ions.

2. The membrane is more permeable to Na+ ions than to K+ ions.

Choroid

Retina

1. Choroid is the middle vascular layer of eye.

1. Retina is the innermost nervous coat of eye.

2. It contains numerous blood vessels that provide nutrients and oxygen to retina and other tissues.

2. It contains photoreceptor cells, rods and cones that are associated with twilight and colour vision respectively.