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Nervous System Ch 50. The brain & friends. Purpose. Communication Relays _______ ______ changes inside and out. Basic Cell. ______ Sends signals called impulses. 3 types of neurons. ______: eye to brain Motor: Brain-spine-muscles ________: Connects the other Two. Neuron Parts. - PowerPoint PPT Presentation
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Nervous SystemCh 50
The brain & friends
Purpose•Communication•Relays _______•______ changes inside and out
Basic Cell•______–Sends signals called impulses
3 types of neurons•______: eye to brain•Motor: Brain-spine-muscles
•________: Connects the other Two
Neuron Parts•____
•______
•_____
•___________
Myelin _____•Made by _______ cells
•conducts impulses _____
• Increases w/ smarts•_____ substance
______ Potential•Na+ is allowed in
Threshhold•Strength of a ________ to cause a response–Ex. toilet flush model
Synapse• Information passage
•_______ signals–_________ _________
Divisions of the Nervous system•_______ NS
–Brain & spinal cord•________ NS
–Everything else–______ to CNS and Efferent
Brain (preview page)•Parts–________–Cerebral cortex–________–Brain stem
Cerebrum•_____ part–All _______ activity•Intelligence, learning…
4 lobes •______•Parietal•_______•occipital
2 hemispheres•L&R control ______ side of body
cerebral cortex•Outer layer–“____ matter”
Cerebellum
•____________•Learning a new physical activity difficult
Brain Stem•Connects to _____ cord
•Reptilian brain
Medulla ________• Involuntary functions–Breathing, _______, heart rate, coughing
Thalamus•Sensory ______•______ is only ________
___________•Hunger, thirst, fatigue, anger, temperature
Brain Function•Cerebral cortex–Locations of specifics
–Wilder Penfield
Brain Waves•Electroencephalogram (EEG)
•Weak ______ signals
Sleep•Lowest level of brain activity
•Brain needs 5-9 hours, body-3 hours
Memory•Long-term/short term
•_____ stick best•More ______ better
Motor Division a part of the ________ NS•_______ nervous system
•________nervous system (smooth muscle control)
Reflexes•______ arch -sensor, motor, effector muscles work w/out brain
Sensory Division (preview page)
•Sight•_______•Smell•_______•Touch
Vision
•Light image sensing
•_ layers in eyes
Outer layer•______- whites- maintains shape & attatches muscle
•______ -light entry
Middle layer•Anterior chamber–________ humor
Middle layer• Iris- gives eye _____–Holds blood vessels
–Regulates____ size
Middle layer•Pupil- black ______ for light entry
Middle layer•Lens- ______ behind pupil bends light for focus
Middle layer•______ chamber- filled with vitreous humor(Liquid)
Inner Layer•______- with ____________ makes images
Inner Layer•Cones- ______•_____- b&w
Hearing
•_________•Sense
Pitch & volume
•_______ (hammer)
•______(anvil)
•______(stirrup)
•_______ moves sound to the auditory nerve
Balance Semicircular Canal•____________ stones for balance
Smell•_________ are cause
•Not much is known about it
Taste•Taste buds- 4 types–_____, salty, _____, bitter
•Related to smell