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Nervous System
By the end of the lesson you should be able to
 Describe the transmission of impulses from senses to
central nervous system and back to muscles.
 Describe the reflex action and the pathway of the
reflex arc.
 Describe the function of reflex response.
 Describe the role of the central nervous system.
Basic nerve cell structure
3 main types of nerve cells
sensory
neurone
relay
neurone
motor
neurone
Sensory neurons
Carries impulses from receptors e.g pain
receptors in skin to the CNS( brain or spinal
cord)
Relay neuron
Carries impulses from sensory nerves to
motor nerves.
Motor neuron
Carries impulses from CNS to effector e.g.
muscle to bring about movement or gland to
bring about secretion of hormone e.g ADH
Transmission of signals
The Synapse
parkinsons
Summary
Function:
 To transmit
Structures:
 Motor, relay &
sensory neurons
messages
from/ to brain  Brain
& spinal cord  Spinal cord
When good organs go bad…
brain & nervous system disorders
 Diseases of the nervous system include:
 Kuru
 Parkinson's
 Obsessive Compulsive Disorder
 Depression
 Alzheimer's
 Huntington’s disease
 Multiple Sclerosis
When good organs go bad…
brain & nervous system disorders
This is your normal,
healthy brain.
This is your brain after
a stroke!
What is different??
Career Connection
 What careers
relate to the
nervous system?
Pharmacist
$93,000
Nuclear Imaging
Tech (MRI/CT)
Sports Medicine
$29,000
$53,000
Social Services
$50,000
Brain
Nasal Cavity
Tongue
Spinal Cord
Salivary Glands
Trachea
Esophagus
Lungs
Heart
Diaphragm
Liver
Gall bladder
Duodenum
Stomach
Kidneys
Pancreas
Large Intestine
Small Intestine
Appendix
Bladder
Rectum