Term
| Myelin is produced by _______ in the CNS and _______ in the PNS. |
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Definition
Oligodendrocytes in CNS
Schwann Cells in PNS |
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Term
| Resting Membrane Potential |
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Definition
| The inside of the cell is negative relative to the outside. Thus the potential is -70mV. |
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Term
| Na/K Pump moves __ Na out and __ K into cell. |
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Definition
| 3 Na out and 2 K in. Uses ATP because moving both ions against their concentration gradients. Makes inside of cell more negative. |
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Term
| What do Na and K do during an action potential? |
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Definition
| Na rushes into cell, action potential occurs, K rushes out of cell, Na/K pump re-establishes concentrations. |
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Term
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Definition
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Term
| Neuronal cell bodies are named _____ in the PNS and _____ in the CNS. |
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Definition
| Ganglia in PNS and Nuclei in CNS. |
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Term
| Forebrain parts and functions |
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Definition
Telencephalon: hemispheres, divided into frontal, parietal, occipital, temporal lobes. Cerebral cortex (gray matter)-highest-level functioning (creativity etc.) Sensory integration. Controls movement.
Diencephalon: thalamus and hypothalamus. Thalamus is gateway to brain for ALL ascending sensory info. |
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Term
| Midbrain parts and functions |
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Definition
| Passes sensory and visual information to forebrain. Passes motor instructions from forebrain to hindbrain. |
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Term
| Hindbrain parts and functions |
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Definition
Cerebellum: Checks that cortex motor signals agree with bodily sensory signals.
Pons: a bridge
Medulla: oldest! ventilation, heart rate, GI tone.
All 3=brainstem. Contains chemoreceptors for CO2 levels. |
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Term
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Definition
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Term
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Definition
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Term
| Path of light through eye |
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Definition
| cornea --> pupil --> lens --> photoreceptors on retina --> bipolar cells --> retinal ganglion cells --> optic nerve |
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Term
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Definition
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Term
| Outer, Middle, and Inner Ear |
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Definition
Outer: auricle, auditory canal
Middle: tympanic membrane, ossicles, oval window
Inner: cochlea, semicircular canals, auditory nerve |
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Term
| Path of sound through ear |
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Definition
| Ossicles vibrate --> exerts pressure on cochlear fluid --> hair cells in organ of corti stimulated --> action potential produced --> potential travels via auditory nerve to brain |
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