Introduction

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
1.immediate reaction
2.memory of experience
?Information enters the CNS:
i.Spinal cord at multiple levels,
ii.Reticular substances of medulla, pons and mesencephalon.
iii.Cerebellum
iv.Thalamus
v.Areas of cerebral cortex
MOTOR PARTS OF NS
?Control different body functions
?Control of skeletal MM from:
i.Spinal cord
ii.Reticular substances of medulla, pons and mesncephalon.
iii.Basal ganglia
iv.Cerebellum
v.Motor cortex
INTEGRATIVE FUNCTION OF NS
?Incoming information ? NS ? processing ? mental and motor functions
1.99% of sensory information discarded by the brain:
2.Only the important information excites the mind
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