unit 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| what are membranes made up of? | connective tissue and epithelial
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| dura mater | tough mater; attaches to cranium
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| acrachnoid | spider web like
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| pia mater | nurishes
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| what are the 3 membranes | dura mater, pia mater, arachnoid materthese 3 form the meninges
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| ectoderm | germ layer of nervous tissue that starts the embryo
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| amytotic | this is why the brain and spinal cord need to be protected
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| ans | visceral nervous system
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| visceral | internal, guts or organs
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| skeletal muscles | these muscles are what makes you move your hand away from a hot stove itf you touch it
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| somatic nervous system | skeletal muscle
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| somo | body
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| cephalization | head area
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| contralateral | R side of the body controls the L side and the L side controls the R side
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| How many spinal nerves do we have? | 31 and they are all mixed
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| 12 pair of cranial nerves | 5 motor 3 snesory 4 mixed
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| how big is a neuron compared to a nerve | very small
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| sensory nerves | to cns and they are only dendrites
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| motor nerves | away from CNS and they are only axons
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| Nerve | a bundle of neruon fibers (they have processes like dendrites and axon) theis is present in nervous system
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| where are internerurons found? | in the spinal nerve
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| fact | nerves do not have cell bodies they have processes
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| facial cranial nerves | mixed nerves; they ahve both dendrites and axons
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| Functional Classification of Neurons | Senory (or afferent), MOTOR (or efferent), INTERNEURONS (or association)
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| Senory neruron | transmit impulses from sensory receptors in the skin or internal organs towards cns
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| Motor Neuron | carry impulses away from the CNS to the effector organs ofthe body periphery
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| Interneuron | lie b/t motor and sensory neurons and shuttle signals thru CNS pathways
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| synapse | "to clasp or join" a junction that mediates info transfer from one neuron to the next
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| electrical synapse | less common variety; consist of gap junctions like those found between certain other body cells
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| chemcial synapse | specialized for release and reception of chemical neurotransmiters made up of 2 parts ; a knoblike axon and a neurotransmitter receptor region on the membrane of a dendrite
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| resting and polarized | a membrane that is not conducting and impulse
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| what protects and nurishes neurons? | astrocytes
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| classification of neurons | by structure and function
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