1. PERIPHERAL NERVOUS SYSTEM
(PNS)
It consists of sensory neurons and motor neurons
which form ganglia and nerves.
GANGLIA
Ganglia are the concentrations of cell bodies of
neurons. It often interconnects with other ganglia to
form a complex system called plexus.
NERVE
Nerves are the bundles of axons or dendrites,
bounded by connective tissue.

2. CLASSIFICATION OF NERVES
Functional Classification
They may be sensory, motor or mixed nerves
depending upon the direction of impulse.
Mixed nerves contains both sensory and
motor nerves.

3. Regional Classification
Cerebral Nerves
 They arise or lead to brain
 Also called Cranial nerves
 All 3 type of nerves
 12 pairs
Spinal nerves
 They arise or lead to spinal cord.
 31 pairs
(8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1
coccygeal)
 Only mixed nerves

4. CLASSIFICATION OF PNS
PNS
SOMATIC AUTONOMIC

5. SOMATIC NERVOUS SYSTEM(SNS)
 Contains Motor neurons
Function
 Controls voluntary actions
 Conscious control of body
 Skeletal movements

6. AUTONOMIC NERVOUS SYSTEM(ANS)
 Contains Motor neurons
Function
 Controls involuntary response
 Unconscious control of body
 Reflex actions

7. CLASSIFICATION OF ANS
ANS
SYMPATHETIC PARASYMPATHETIC

8. Features
• Origin
• Position of ganglia
• Pre-ganglionic fibers
• Post-ganglionic
fibers
• Functions
• Actions
Sympathetic
• Mid of spinal cord
• Thoracic region
• Near spinal cord
• Short
• Long
• Works in emergency
• Accelerates heart
beat
• Dilates pupil
• Inhibits digestion
• Rise in blood
pressure
Parasympathetic
• Bottom of spinal
cord
• Lumbar region
• Near effectors
• Long
• Short
• Promotes relaxation
• Retards heartbeat
• Constriction of pupil
• Promotes digestion
• Lowering of blood
pressure