Nervous system
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| What are the functions of the nervous system? | show 🗑
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| What is the central nervous system composed of? | show 🗑
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| show | 1. Cranial nerves and ganglia (12)
2. spinal nerves and ganglia (31)
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| What is the brain and spinal cord covered by? | show 🗑
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| What are the 3 layers of Meninges? | show 🗑
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| Where is the CSF (Cerebrospinal fluid)located? | show 🗑
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| show | Transmit electrical signals and are found in grey matter of CNS and ganglia
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| What are neuroglial cells? | show 🗑
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| What are the 4 neuroglial cells in the CNS? | show 🗑
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| What is the function of Astrocytes? | show 🗑
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| What is the function of Microglia? | show 🗑
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| What is the function of Ependymal Cells? | show 🗑
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| show | Produce myelin sheath in CNS
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| show | 1. Satellite Cells
2. Schwann cells
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| show | Surround neuron cell body
Blood brain barrier
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| show | Form myelin sheath around axons of PNS
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| show | 1. Excite/ inhibit neurons
2. axon terminals
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| show | Site at which neurons communicate
(pre, post)
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| Where are the Na+ channels located in axons? | show 🗑
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| show | short-lasting excitation of cell, membrane potential of cell rises rapidly then falls
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| show | -80mV (net charge outside is positive and inside negative)
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| How does Neuron maintain polarity after action potential? | show 🗑
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| show | 1. Endoneurium- surrounds axon
2. Nerve Fascicles- group of axon in bundle
3. Perineurium- surrounds nerve fascicle
4. Epineurium- covers whole nerve in tough fibrous sheath
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| show | Terminal end of the spinal cord, near (L1)and(L2)
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| show | Dangling nerve roots of spinal cord after Conus medullaris
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| show | Terminal nerve root tail
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| What are the 5 essential components of the reflex arc? | show 🗑
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| Describe receptor component of reflex arc | show 🗑
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| show | transmits afferent impulses to CNS
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| Describe integration center component of reflex arc | show 🗑
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| Describe motor neuron component of reflex arc | show 🗑
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| show | Muscle or gland cell that responds to efferent impulses
Contracts or secretes
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| show | Brain
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| show | Reflex upon 1 synapse (fastest)
Ex. knee-jerk reflex
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| show | Reflex upon multiple synapse (more common)
Ex. Withdrawal reflexes- burn finger, withdraw finger and arm
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