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reflex arc (exam4)
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what is a reflex arc?
the most basic form of conduction pathway
what ae the 2 common types of reflex arc?
1.monosynaptic reflex arc
2.bisynaptic reflex arc
what is monosynaptic reflex arc? give and example
consistes of 2 neurons with only one synapse
ex:patellar tendon reflex
what is a bisynaptic reflex arc? and give and example
consists of 8 neurons and 2 synapses
ex:response to extreme heat
what is a reflex?
a quick, involuntary response to a stimulus-> transmitted over a reflex arc
reflexes are good diagnostic tools to evaluate conditions of nervous system categories of reflexes. what are those categories?
1.superficial reflexes
2.deep reflexes
3.pathological reflexes
what aresuperficial reflexes?
involved cutaneous stimulation
a)abdominal reflex->causes contraction of abdominal muscles
what are deep reflexes?
involve stimulation of deep structures like tendons
a)patellar tendon reflex, achille's tendon reflex, biceps reflex, triceps reflex,etc.
what are pathological reflexes?
reflexes that reveal specific damage info about the nervous system
what is a babinski reflex?
stimulus-> stroking the lateral aspect of the sole of foot from the heel toward the toe
what is a positive babinski?
dorsiflexion of the great(big) toe-> with or with out slight fanning of other toes
this means incomplete development of the nervous system:
1.normal in infants up until about 18 months of age-> indicates incomplete myolination
2.in adults it indicates trama or disease of the
"corticospinal tract"
Author
rcrchick
ID
14861
Card Set
reflex arc (exam4)
Description
exam4 reflex arc
Updated
2010-04-17T00:22:22Z
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