Motor System Overview
Quiz by OASIS
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14 questions
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- Q1Each muscle fiber is innervated by numerous alpha motor neurons.TRUEFALSE30s
- Q2All of the following are true regarding Type IIa muscle fibers except:Recruited in the middle of the muscle contraction envelope.They have relatively slow contractile timeHave intermediate to slow rates of fatigueGenerate larger tension than Type I muscle fibers30s
- Q3Which of the following is an advantage of parallel processing?It makes sure that only one area of the brain is responsible for the control of a specific movement.It helps converge multiple sensory pathways into one pathway for easy processingNone of the aboveIt allows for motor function to not be lost when part of the primary motor cortex is damaged or blocked.30s
- Q4The anterior corticospinal tract is responsible for:Motor innervation of the head and faceSending sensory information from the upper and lower extremities to the somatosensory cortexMotor innervation of the upper and lower extremitiesMotor innervation for postural control and proximal body musculature30s
- Q5The reticulospinal tracts have functions in all of the following except:PostureUrine continenceMuscular paralysis during sleepShivering30s
- Q6From what structure does the vestibulospinal tract receives most of its motor influence?Cerebral cortexBrainstemThalamusCerebellum30s
- Q7According to Henneman’s size principle __________ motor neurons with smaller thresholds will be recruited first followed by __________ motor neurons with higher thresholds.Smaller; LargerLower; UpperUpper; LowerLarger; Smaller30s
- Q8Which of the following motor units can be characterized by a relatively fast contractile time and has intermediate to slow rates of fatigue?Type IType IIaType IIbType III30s
- Q9Excessive amounts of muscle tone in a patient’s postural muscles could be an indication of what injury?LMN lesionExtrafusal muscle fiber strainUMN lesionDecreased amounts of gamma activation30s
- Q10Changes in muscle tension are sense by which of the following receptors?Pacinian CorpusclesMuscle SpindleGTOMerkel Disc30s
- Q11A patient in an fMRI is told to randomly move their foot (without giving this action any thought). Which of the following areas will show activity as measured by the fMRI?Postcentral Gyrus SBoth Supplementary Motor Area and Precentral GyrusPrecentral Gyrusupplementary Motor Area30s
- Q12All of the following cranial nerves are innervated by the corticonuclear (coricobulbar) tract except which?CN VIICN VIIICN IXCN VI30s
- Q13What is one function of the rubrospinal tract?Influence forearm extensorsInitiate shiveringControl of postureInfluence forearm flexors30s
- Q14Which of the following pathways, if lesioned, will affect parasympathetic control?HypothalamospinalHypothalmumedullaryCorticalspinalRubrospinal30s