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**Nervous System, Melissa Benitez, period 1 (Major part of the brain and…
**Nervous System, Melissa Benitez, period 1
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Action potential
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outward current: flow of positive charges out of the cell, down their concentration gradient. Cause of hyperpolarization
Inward current: flow of positive charges into the cell down its concentration gradient. Cause of depolarization.
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Cranial nerves
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Accessory-controls shoulder and neck muscles involved with head movement. 2 Branches, one controls trapezius and sternocleidomastoid in neck. Other supplies muscle to larynx.
Hypoglossal- motor nerve for all intrinsic tongue muscles, impulses controlling tongue muscles
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Trigeminal-sensory of touch, pain, and temperature for the eye, upper and lower jaw.
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Neurotransmitters
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Excitatory effect-a neurotransmitter effect that makes it more likely that the receiving neuron will generate an action potential
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Spaces & ventricles
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Subarachnoid space: between arachnoid and pia; contains cerebrospinal fluid (CSF) to bathe and cushion the brain and spinal cord
Subdural space: between dura and arachnoid, contains serous fluid
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fourth ventricle:
between cerebellum & brainstem, empties into central canal
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