Shared Flashcard Set

Details

Martin
Reflexes
24
Medical
Graduate
03/09/2011

Additional Medical Flashcards

 


 

Cards

Term
1 b fibers
Definition
Golgi tendon organ afferent fibers
Term
function of GTO
Definition
in tendon; dampens excessive tension; glycinergic interneurons; requires more tension than myotactic reflex; crossed extensor component
Term
GTO crossed extensor component
Definition
cause extension of antagonist via
Term
GTO inhibits and stimulates what?
Definition
inhibits alpha motor neuron of homonomynous muscle and stimulates alpha motor neuron of antagonist muscle
Term
flexor withdrawl reflex
Definition
ipsilateral flexion, contralateral extension; remove limb from danger/maintain balance; stimulus is usually pain or potential pain; non-linear and requires adequate stimulus
Term
flexor withdrawl reflex resembles what
Definition
fixed action pattern
Term
FWR is a polysynaptic reflex and acrosses via what structure in spinal cord
Definition
gray commisure
Term
light touch to foot pads has what effect
Definition
ipsilateral extension; opposite of FWR
Term
what does divergence function to do?
Definition
create a larger stimulus
Term
what is local sign?
Definition
site of stimulation which determines final limb positon in FWR; outside versus inside of foot
Term
prepotent
Definition
preempt all other muscle activity; FWR is prepotent
Term
medulla reflexes
Definition
integration of coughing sneezing and gagging; CN 5,9,10 usually; efferent fibers are mostly somatic
Term
1A afferents secrete
Definition
secrete glutamate to excites interneurons; 1 single fiber can excite all alpha motor neurons of muscle neuron pool
Term
glycine transporters
Definition
in presynaptic terminal and adjacent glial cells and vesicles for the reuptake of glycine
Term
circuits can be dismantled without growth factors maintaining them
Definition
e. GDNF: glial cell growth factors keep dopamine secreting neurons alive in brain
Term
NT-4 growth factors
Definition
adult motor neurons
Term
Nerve growth factor
Definition
Maintains dorsal root ganglion
Term
Sherrington
Definition
described myotatic reflex in the 1890's
Term
reciprocal inhibition
Definition
Term
recurrent inhibition
Definition
stimulation of Renshaw cell via (glutamate) makes Renshaw stimulates
Term
glycine receptor
Definition
chloride channel; hyperpolarizes postsynaptic cell
pentameric
Term
startle disorder
Definition
genetic insensitivity to glycine
Term
inverse myotatic reflex
Definition
GTO/Clasp Knife Reflex
Term
Inverse myotatic mechanism
Definition
1 b fiber from GTO stimulates two interneurons... 1 to inhibit homonymous and synergist muscle via glycine and 1 to stimulate antagonist muscle via glutamate
Supporting users have an ad free experience!