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18 Cards in this Set
- Front
- Back
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muscle tone is regulated by (alpha/gamma) |
gamma |
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why do we stretch in the morning |
resets muscle spindles and re calibrates gamma system |
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what is golgi tendon organ used for and what axon class is used? |
muscle tension and Ib |
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what do inhibitory interneurons do and where is it located |
they inhibit alpha motor neurons when there is golgi tendon organ activity. Located on spinal cord |
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what is the the reverse myotatic reflex |
when golgi tendon organ activity inhibits alpha neurons |
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when there is too much force, alpha activity is (high/low) |
low |
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when Ib activity is low, alpha activity is (high/low) |
high |
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where do alpha neurons get their inputs |
1. primary sensory axons 2. upper motor neurons from motor cortex 3. spinal internuerons |
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describe agonist and antagonist stretch reflex |
contraction of agonist is accompanied by relaxation of antagonist |
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describes multi segment reflex and another name for this |
coordinated contraction of multiple muscles across multiple spinal segments. Reflex when you step on like a tack; flexor reflex |
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describe bilateral reflex and another name for this |
crossed-extensor reflex; activation of extensor muscles and inhibition of flexors on opposite side of body |
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what are CPGs and what are they used for |
central pattern generators; rhythmic aspect of walking |
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in constant glutamate, cycle will (walk/stop) |
walk; activates NMDA mech |
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during NMDA mechanism, when Mg block is added, Ca (goes in/cant go in) |
cant go in |
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what is reciprocal inhibition when pacemakers are involved |
mechanism for alternating flexor extensor activity |
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what is going on duchenne muscular dystrophy |
mutgation in dystrophin- protein that binds actin filaments to plasma membrane. X linked |
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What is going on in myasthenia gravis |
immune system attachs ACh receptors. Treated by AChE inhibitors; increasing duration of ACh |
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whats going on in ALS and whats an alt name for it |
lou gehrig's disease; degeneration of upper and lower motor neurons. Unknown cause. |
