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| How many pairs of cranial nerves are there? |
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| a bundle of hundreds to thousands of axons plus connective tissue and blood vessels that lie outside the brain and spinal cord |
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| 31 pairs emerge from the spinal cord serving specific regions of the body |
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| small masses of nervous tissue containing the neuron cell body located outside of the brain or spinal cord Ex: dorsal root ganglia |
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| the dendrites of sensory neurons that monitor changes in the internal or external environment |
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| muscles and glands that are activated through spinal and cranial nerves. |
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| peripherial nervous system |
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| nervous tissue outside of the cns |
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| an electrical signal that travels along the surface of the membrane of a neuron due to the movement of ions (sodium and potassium) between interstitial fluid and the inside of a neuron through channels. |
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1. cell body
2. dendrites
3. axon |
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| contains a nucleus currounded by cytoplasm containing organelles lysosomes, mitochondria, and golgi complex |
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| the receiving or input portion of a neuron |
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| propegates nerve impulses toward another neuron, muscle fiber, or gland cell |
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| where the axon and the cell body join. |
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| the part of the axon closes to the axon hillock |
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| the junction of the axon hilllock and the initial segment where nerve impulses arise from |
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| the site of communication between a neuron and an effector cell |
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| bulb shapped structures at the axon terminals that contain tiny membran-enclosed sacs |
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| membrane enclosed sacs in synaptic bulbs |
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| a chemical that has different effects on postsynaptic cells depending on its type |
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| contain several dendrites and one axon. CNS nerves are multipolar |
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| contain one dendrite and one axon. Found in the eye, inner ear, and olfactory area of brain |
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| contain dendrites and one axon fused together to for a continuous process that emerges from the cell body. emerge from bipolar neurons in the embryo. typically sensory receptors to detect touch, pressure, pain, or thermal stimuli. |
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| found in the cerebral cortex of the brain |
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| Functional classification of neurons |
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| referes to direction in which the nerve impulse is conveyed with respect to the CNS. Ex: sensory or afferent neurons |
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