| central nervous system components | Brain
spinal cord
contains relay neurons(interneurons) |
| Peripheral nervous system components | 12 pairs of cranial nerves. (arise from brain ie optic, audio)
31 pairs of peripheral nerves (arise from spine)
contains: sensory neurons
motor neurons |
| devisions of the PNS | afferent(away from CNS)
-somatic from organs
-viceral from skin and organs
Efferent (towards)
-somatic- skeletal muscles
-Autonomic-heart, involuntary muscles, glands
i. sympathetic-fight flight
i.i. parasympathetic -normal function |
| Cerebrum | Biggest section
outer surface= grey matter
inner = white matter- militated fibres
additional grey matter central- basal ganglia
mental functions such as thinking, reasoning, learning, memory
perception, senses, control of VOLENTARY MUSCLE CONTRACTIONS |
| thalamus | grey matter structure near brain centre, above mid brain
just above hypothalamus |
| lobes of cerebrum | frontal -cognitive function, voluntary movement
parietal lobes, info about taste, temp, touch, movement
occipital -vision
tempural -memory and senses |
| corpus callosum | wide band of nerved under cerebrum, crossing hemispheres, allows brain communication |
| Cerrebellum | lies under rear cerebrum
posture, balance, fine coordination, voluntary muscles
receives sensory info from ear, posture balance
and stretch receptors-muscles |
| hypothalamus | middle brain bellow pituitary
homeostasis |
| Medulla oblongata | continuation of spine
vital control center
cardiac, respiratory, vasomotor, reflexes, swallowing, coughing
regulated by hypothalamus |
| cerebral cortex | outer layer of cerebrum-consists of the 4 lobes |
