1. Nervous System
HLTAP301A

2. Nervous System Communication and control centre of the body
Structurally divided into CNS and PNS
CNS
Brain and spinal cord
2. PNS
Spinal nerves and cranial nerves
Further divided into
Sensory which monitors changes and carry info to CNS
Motor info is sent from CNS towards muscles and glands causing a response

3. Neurons
Most important in the transmission of information

4. Neuroglia
Support, protect, insulate, nourish and generally care for neurons

5. CNS

6. CNS Covered by 3 layers of membrane called meningies
Dura mater is outer most layer
Arachnoid mater is middle layer
Pia mater is inner most layer
Between arachnoid and pia is the subarachnoid space filled with CSF
CSF provides nourishment to CNS as well as cushioning CNS

7. NERVOUS SYSTEM

8. The Brain Divided into functional sections Cerebrum Largest section
Divided into R and L hemispheres
Each hemisphere has 4 lobes
Functions include memory, association, thought and judgement

9. BRAIN

10. The Brain 2. Cerebellum Second largest section
Posterior and inferior to cerebrum
Function is to coordinate voluntary movements by maintaining balance, posture and muscle tone

11. BRAIN

12. The Brain 3. Brain stem Connects cerebrum to spinal cord
Provides a pathway for ascending and descending tracts
Divided into sections called
Midbrain
Pons
Medulla oblongata

13. Brain Functions Frontal lobe Motor area Personality Behaviour
Emotive expression
Intellectual functions
Memory storage

14. Brain Functions
2. Parietal lobe
Sensory area
Taste
Speech
reading

15. Brain Functions 3. Occipital lobe Vision Reading interpretation
Judging distances
Seeing in 3 dimension

16. Brain Functions 4. Temporal lobe Hearing Smell Taste Memory storage
Part of speech area

17. Brain Functions 5. Thalamus Relays sensory information to cerebrum
6. Hypothalamus
Regulate temperature
Water balance
Sex
Thirst
Appetite
Pleasure and fear

18. Brain functions 7. Midbrain Relays sensory and motor information
8. Pons
Plays a role in respiration
9. Medulla oblongata
Regulate heart rate, blood flow, blood pressure, respirations
Reflex for coughing, sneezing, swallowing and vomiting

19. Brain functions 9. Cerebellum Coordinates voluntary muscle activity
Maintains balance and muscle tone

20. PNS Divided into Somatic NS Controls skeletal muscles
12 pairs cranial nerves supplying above the neck
31 pairs supplying trunk and limbs
2. Autonomic NS
Controls involuntary movements of internal organs and gland secretions
Also divided into
Sympathetic NS which acts when we are excited, frightened or exercising.
Parasympathetic NS which slows body functions back down

21. NERVOUS SYSTEM