Neurophysiology Set 2

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MCQ

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1. The gray matter of the primary somatosensory cortex contains six layers of cells. Which of the
following layers receives the bulk of incoming signals from the somatosensory nuclei of the thalamus?

A) Layer I

B) Layers II and III

C) Layer III only

D) Layer IV

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2. Nuclear chain fibers of the muscle
spindle are innervated by:

A) Type A- alpha and A- delta fiber

B) Type A- alpha and C fibers

C) Type Ia and II

D) Type II only

E) Type Ia only

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3. Lower motor neuron lesions cause all the following, except :

A) decreased number of transmitter receptors in the denervated muscle

B) atrophy of the denervated muscle

C) flaccid paralysis of the denervated muscle

D) loss of flexion withdrawal reflex

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4. Co-activation of a and y-motor
neurons :

A) increases y-motor neuron discharge whenever the activity of a-motor neurons rises to a high level

B) is mediated by interneurons that link the a and y-motor neuron

C) maintains the proprioceptive information to higher centers during muscle contraction

D) increases the a-motor neuron discharge whenever the activity of y-motor neurons rises to a high level

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5. Representation of body movement in
primary motor area is :

A) ipsilateral

B) upright

C) disproportianate to the actual anatomical size

D) bilateral

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6. Thermal receptors are :

A) slowly adapting receptors

B) rapidly adapting receptors

C) biphasic receptor

D) all encapsulated receptors

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7. The Earliest spinal reflexion that
recovers from spinal shock is:

A) The Urination reflex

B) The scarche reflex

C) The stretch reflex

D) The flexor reflex

E) The interverse reflex

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8. Thermal sensations :

A) are evoked by all changes in environmental temperatures

B) are evoked by stimulation of thermo-sensitive pain receptors

C) are involved in regulation of metabolic activity

D) are transmitted by Aβ sensory fibers

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9. The central nervous system includes all the following components, except :

A) spinal cord

B) medulla oblongata

C) autonomic ganglia

D) diencephalon

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10. A reflex action

A) is a fast brief response to a sensory stimulus

B) is involved in regulation of voluntary movements

C) includes at least three sequential sets of neurons in its pathway

D) is always initiated whenever its specific receptors are effectively stimulated by a specific stimulus

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11. All of the following are descending motor tracts, except :

A) Rubrospinal tract

B) Spinotectal tract

C) Reticulospinal tract

D) Corticobulbar tract

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12. visceral pain is

A) visceral pain is usually deep in disease viscera

B) deep to tissue close to the visceral disease

C) in skin are that just overlie the deep viscera

D) in skin are remote from visceral disease

E) with 0.1 sensation

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13. Pain threshold :

A) is the highest intensity of stimulus that causes pain

B) is the lowest intensity of stimulus that causes pain

C) differs markedly among different individuals

D) is elevated by substance P

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14. Astereognosis :

A) indicates inability to localize the site of touch on the body surface

B) results from lesions of the secondary somatic sensory area

C) associates parietal lobe neglect

D) results from loss of crude touch sensation

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15. Fine touch :

A) free nerve endings

B) hair follicle receptors

C) hair cell receptors

D) Ruffini nerve endings

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16. Pain from the stomach is referred to which area of the body?

A) upper right shoulder area

B) abdominal area above the umbilicus

C) proximal area of the anterior and inner thigh

D) abdominal area below the umbilicus

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17. Stimulation of which brain area can modulate the sensation of pain?

A) Superior olivary complex

B) Locus ceruleus

C) Periaquaductal gray

D) Amygdala

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18. Most sensory receptors :

A) are stimulated by different types of stimuli

B) are stimulated only by specific stimuli

C) posses a high threshold for their specific stimuli

D) only ‘b’ and ‘c’ are correct

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19. Basal ganglia include all the following, except :

A) caudate nucleus

B) dentate nucleus

C) subthalamic nucleus

D) substantia nigra reticulate

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20. Prolonged changes in neuronal activity are usually achieved through the activation of

A) voltage-gated chloride channels

B) transmitter-gated sodium channels

C) G-protein–coupled channels

D) voltage-gated potassium channels

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21. In UMN lesions the response to plantar reflex :-

A) becomes exaggerated

B) becomes inhibited

C) becomes modified

D) is absent

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22. In the control of emotion and
motivation, the limbic system work
together with:

A) pons

B) thalamus

C) hypothalamus

D) cerebellum

E) basal nuclei

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23. The highest degree of pain localization comes from

A) simultaneous stimulation of free nerve endings and tactile fibers

B) stimulation of free nerve endings by bradykinin

C) nerve fibers traveling to the thalamus by way of the paleospinothalamic tract

D) stimulation of type A delta fibers

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24. The Rubrospinal tract :

A) originates from the pontine reticular formation

B) descends contralaterally

C) controls activity of axial muscles

D) is a component of the medial motor system

E) controls the movment of proximal and distal limb muscle

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25. Chemical transmitters in basal
ganglia include all the following, except
:

A) GABA

B) Dopamine

C) Glutamate

D) Glycine

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Neurophysiology Set 2

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