physio final Flashcards
the tracts which go from the cortex to the cerebellum are ?
corticopontocerebellar (pontine nuclei)
corticoreticulocerebellar (lateral reticular nuclei)
corticovarylcerebellar (INFERIOR olivary nuclei)
if the movements come from the cortex without the correction and the monitoring from the cerebellum, they will be —————
pendular
true or false
the same circuit in the spinal cord can be used for more than one function
true
true or false
the spinal cord has a very organized structure that if one are is destroyed only one muscle might be affected
true
what are propriospinal fibers ?
ravel up and down the cord for 1 - 2 segments, provide pathways for multisegmental reflexes.
How much increase or decrease in firing rate depends ?
the rate of change of muscle length
Function of the Gamma System
1- Spindle is normally tonically active as a result of input from higher brain centers.
Alpha-gamma co-activation helps maintain muscle contraction.
2- Controls the intensity of the stretch reflex.
3- Performs a damping function by adjusting sensitivity.
Gamma signal excited by
bulboreticular facilitatory area of the brain stem
what type of fibers are stimulated in tendon reflex ?
type 1b
in tendon reflex reciprocal inhibition causes stimulation or inhibition ?
stimulation; it is called reciprocal activation
true or false
Golgi tendon organs are in parallel to the muscle fibers while muscle spindle are in series with muscle fibers
false. opposite
in flexor reflex , the duration of the after discharge depends on
the strength of the stimulus
which one of these is the slowest reflex
flexor , tendon, stretch
flexor; because it uses, A delta and c fibers and because it is polysynaptic
Crossed extensor reflex serves to
to push body away from the stimulus,
also to shift weight to the opposite limb
otolith organs can detect changes in the rate of
——– motion or ——- acceleration
linear, linear
