Central Nervous System

Central Nervous System
GENERAL DESIGN
100 billion neurons
Incoming signals
Synaptic connections
Out put signals
Signal transmission through synapses ? forward direction
SENSORY PARTS OF NS
Sensory experience ? excites sensory receptors
immediate reaction
memory of experience
Information enters the CNS:
Spinal cord at multiple levels,
Reticular substances of medulla, pons and mesencephalon.
Cerebellum
Thalamus
Areas of cerebral cortex

MOTOR PARTS OF NS
Control different body functions

Synapses & Information Processing

Junction point
Determine the directions of signals.
Easy and difficult transmission of signals
Synaptic transmission controlled by facilitatory and inhibitory signals from other areas in the NS
Postsynaptic respones
Synapses perform a selective action

Control of skeletal MM from:
Spinal cord
Reticular substances of medulla, pons and mesncephalon.
Basal ganglia
Cerebellum
Motor cortex
INTEGRATIVE FUNCTION OF NS

Incoming information ? NS ? processing ? mental and motor functions
99% of sensory information discarded by the brain:
Only the important information excites the mind