Nervous System By the end of the lesson

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 Small Intestine Appendix Stomach Kidneys Pancreas Large Intestine Bladder Rectum