Sensory System Lesions
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21 questions
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- Q1Which area of the brain is a major source of regulatory input to the thalamus?Reticular thalamic nucleusReticular formationBasal gangliaCerebral cortex30s
- Q2Which is FALSE regarding the following areas of primary somatosensory cortex?Area 3a receives proprioceptive input from muscleArea 2 processes proprioceptive input from joint afferentsArea 1 receives the densest thalamic projections of sensory areasArea 3b receives information from cutaneous receptors related to the size, shape and texture of an object30s
- Q3If the right index and middle finger are lost in an accident, what changes might you expect from the cortical representation related to that area?The cortical representation of adjacent fingers will take over the areas previously dedicated to those that were amputatedThe cortical representation of the right index and middle finger will be relocated to the left index and middle finger.If changes do occur, it is a very slow process taking up to years to respondNothing, the cortical representation would remain the same30s
- Q4Which of the following is TRUE regarding the secondary somatosensory cortex (SII)?The receptive fields of SII are small and very distinct from one anotherIt is organized such that the foot is represented adjacent to the head region of SIInput to SII come from both sides of the body and headIt is located adjacent to the primary somatosensory cortex (SI) on the postcentral gyrus30s
- Q5Goal directed voluntary movements, object manipulation, and visually guided movements are related to which region of somatosensory cortex?Temporal cortical regionsOccipital cortical regionsFrontal cortical regionsParietal cortical regions30s
- Q6An abnormal sensation that is unpleasant not may not be directly painful is known asHyperalgesiaDysesthesiaHyperpathiaParesthesia30s
- Q7A selective sensory loss of modalities (i.e., loss of pain and temperature but not vibration sense) is less common in which of the following areasT10L4In the ventrobasal complexS230s
- Q8Unilateral brainstem lesions generally result inContralateral cranial nerve dysfunction and ipsilateral sensory and/or motor deficits for the bodyInvolvement of cranial nerves but not sensory and/or motor long tractsIpsilateral cranial nerve dysfunction and contralateral sensory and/or motor deficits for the bodyIpsilateral cranial nerve dysfunction and ipsilateral sensory and/or motor deficits for the body30s
- Q9What is FALSE regarding thalamic lesions?Sensory deficits from thalamic lesions are contralateral and usually incompleteLesions of the VPL or VPM usually produce sensory and motor deficitsA lesion to the left thalamus will result in damage to the right face and bodyCommon symptoms of thalamic pain syndrome include hemianesthesia, astereognosis, dysesthesia, and hyperpathia30s
- Q10Somatosensory cortex lesionsResult in somatosensory losses where discriminative touch and proprioception recover first and completelyAre recognized clinically by the primary symptom of astereognosisCan produce corresponding sensory loss in the body area of the somatotopic map but not in the modalities served30s
- Q11What kind of pain can be explained by the convergence of nociceptive fibers from different sources on the same second-order neuron in the spinal cord or in the thalamus?Fast painPain matrixSlow PainReferred Pain30s
- Q12Which of the following brainstem areas can inhibit nociceptive information coming from the anterolateral system?Rostral ventromedial medullaCeruleospinal tract (from locus coeruleus)Raphespinal tractPeriaqueductal gray30s
- Q13Which of the following is a function of a free nerve ending?Vibration SensationCutaneous SensationProprioceptionTemperature Sensation30s
- Q14The ability to discriminate accurately where a stationary fly is on your body is determined by what factor(s)?The size and number of receptive fields where the fly has landed onThe number of receptive fields the fly has landed onIf the fly has landed on a hair receptorHow large the receptive field is where the fly has landed on30s
- Q15Higher intensity input can be focused through the dorsal column nuclei to define edges and boundaries via what mechanism?Feed-Forward InhibitionFeedback Loop SynergyMedial InhibitionLateral Inhibition30s