NERVOUS SYSTEM & NERVE CELLS

NERVOUS SYSTEM & NERVE CELLS

SHIMA JAMALUDIN

Senses changes in our internal & external
environments, coordinates and integrates this
data and initiates & transmits action potentials.

Central Nervous System Peripheral Nervous System

Brain & Spinal Cord 12 pairs Cranial Nerves, 31
pairs of spinal nerves, ganglia

Peripheral Nervous System

Sensory @ Afferent Motor@ Efferent
Division Division

Perception Response
Entry point for any Somatic
Autonomic (Sympathetic,
stimulus Parasympathetic)
Includes Somatosensory
Somatic
system (receptors) Autonomic NS

Somatic
Special senses

THE SENSORY RECEPTOR
DETECT THE STIMULUS

THE SENSORY RECEPTOR
SEND A SIGNAL TO THE

BRAIN

THE SIGNAL IS
INTERPRETED &

ASSESSED





Functions of the Nervous Sensory function
System Sensory receptor detect stimuli
(internal and external stimuli) and then
Motor function carried in to the spinal cord and brain.
Once sensory information is
integrated, the nervous system will Integrative Function
elicit an appropriate motor response Integrates (processes) sensory
by activating effectors (muscle and information by analyzing and storing
gland) through cranial and spinal the information, making decision for
appropriate responses (integration)
nerves. Important integrative function is
This stimulation causes the muscles
perception.
contract and glands to secrete.

Structure of Neuron

initiate the respond to a stimulus
conduction of and convert it into an
action potential
action potential
(impulses).

Action potential: electrical signal that propagates
along the surface of the membrane of a neuron.

Neuron Classifications
(Structural)

Neuron Classifications MMoottoorr nneeuurroonn
(Functional)

SeSennssoorryy Neeuurroonn

InInteterrnneeuurroonn

12

Neuroglia



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