- ensures the whole body responds appropriately
- to external conditions.
- central nervous system (CNS)
- peripheral nervous system(PNS).
3. CNS is:
- divided into somatic + autonomic nervous system.
- made up of brain + spinal cord,
4. PNS is:
- made up of paired cranian + spinal nerves.
5. Brain is:
- made up of grey matter (located in the outer cortex) + white matter (inside brain)
- divided into 3 regions: forebrain, midbrain, hindbrain.
6. PNS has 2 sets of neurons: sensory + motor neurones.
7. Motor neurones are divided into: somatic + autonomic nervous system.
8. Divisions of the autonomic nervous system are distinguished by where the nerves originate.
9. Nerves of the sympathetic nervous system emerge from:
- upper + central spinal cord regions
- thoracic regions
- lumbar regions.
10. Nerves of the parasympathetic nerves system originate from:
- cranial nerves
- sacral region of the spinal cord.
11. Autonomic nervous system:
- controls the involuntary activities
- of the internal organs.
12. Parasympathetic nervous system:
- maintains the normal functioning of the body
- in a non-threatening situation
- helps keep the body in a relaxed + unstressed condition.
13. Sympathetic nervous system:
- brings about physiological responses
- to threatening situations.
14. A neurone:
- nerve cell:
- which conveys information
- in the form of nerve impulses
- basic functional unit of the nervous system.
15. There are 3 types of neurones:
16. Motor neurones - carry impulses - from the CNSà to effectors.
17. Sensory neurones - carry impulses - from sensory receptors à to the CNS.
18. Interneurones - relay impulses - between sensory + motor neurones.