Central Nervous System

(CNS)

Major components:              brain and spinal cord

             Sensory integration and

                           command  center.  Directs Function:                   motor responses based

on memories, reflexes,

and current conditions.

Peripheral Nervous System

(PNS)

Ganglia

Major Components:                       Spinal Nerves

Cranial Nerves

Function:                           Links the rest of

the body to CNS

Ganglia

All nerves extending from brain and spine

Spinal Nerves

Sensory information from spine

(reflex areas)

Cranial Nerves

Sensory information to and from brain.

Afferent Subdivision

Subdivision of PNS

Sensory: converts information from body to CNS

Somatic Afferent

Skin, skeletal, joints

Visceral Afferent

Body organs

Efferent Subdivision

Subdivision of PNS

Motor: nerves effecting action from CNS

"E" for "Exit"

Somatic/Voluntary nervous system

(SNS)

Efferent

CNS to Skeletal muscles

Under conscious control