Nervous System Overview

Nervous System

Central Nervous System (CNS)

Peripheral Nervous System (PNS)

Brain

Spinal Cord

Sensory (afferent division)

Motor (efferent division)

Somatic (voluntary) Nervous System

Autonomic Nervous System

Somatic sensory fibres

Visceral sensory fibres

Conveys sensory impulses from skin, skeletal muscles, joints, cornea and conjunctiva

Conveys sensory impulses from visceral organs (e.g. digestive tract)

Conscious control of skeletal muscles.

The ANS function:

Visceral motor nerve fibres.

Involuntary system.

Regulates smooth muscle (e.g. iris, CB), cardiac muscle and glands (e.g. lacrimal)

Parasympathetic Nervous System

"rest and digest"

Sympathetic Nervous System

"fight or flight"