1876808
Descrição
Quiz por #أطباء_2020 , atualizado more than 1 year ago
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Criado por #أطباء_2020
mais de 9 anos atrás
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Questão 1
Questão
regarding reflexes :
Responda
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a monosynaptic reflex arc involves one or more interneurons
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the knee jerk reflex is an example of a stretch reflex
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interneurons are the final common path for all reflexes
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withdrawal reflexes are lost following cervical section of spinal cord
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none of the above
Questão 2
Questão
motor impulses are transmitted by :
Responda
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dorsal root of spinal nerves
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dorsal root ganglia of spinal nerves
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ventral roots of spinal nerves
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none of above
-
all of the above
Questão 3
Questão
which of the following is the type of neuron whose axons forms synaptic junctions with sk. muscle cells "intrafusal fibers" within the muscle spindles ?
Responda
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alpha motor neurons
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pyramidal neurons
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gamma motor neurons
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granule cells
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purkinje cells
Questão 4
Questão
which of the following types of neurons is the efferent of nuclear bag intrafusal fibers that signal a change in muscle length ?
Responda
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static gamma motor neurons
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alpha motor neurons
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dynamic gamma motor neurons
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corticospinal neuron
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renshaw cell
Questão 5
Questão
which of the following receive direct synaptic input from Golgi tendon organs ?
Responda
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type Ia inhibitory interneurons
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dynamic gamma motor neurons
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alpha motor neurons
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type Ib inhibitory interneurons
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type II excitatory interneurons
Questão 6
Questão
concerning motor cortex :
Responda
-
the motor areas of the cortex are situated in the postcentral gyrus
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following a cerebral haemorrhage affecting the precentral gyrusof the right hemisphere , the patient feels no sensations on left side of the body
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the corticospinal tract provides the only connection between the motor cortical areas and the spinal cord
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motor areas of the cortex receive somatosensory input via the thalamus
Questão 7
Questão
which statement concerning the premotor cortex is correct ?
Responda
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the premotor cortex is located just posterior to the primary cortex
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the lateral to medial sequenc in the somatotopic organization of premotor cortex is the reserve of that seen in the primary motor cortex
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stimulation of a small discrete group of neurons in the premotor cortex produces contraction of an individual muscle
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stimulation of the premotor cortex does not lead to any muscle activation
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the premotor cortex sets the specefic posture required for the limb to produce the desired movement
Questão 8
Questão
a stroke involving the middle cerebral artery on the left side is likely to cause which of the following symptoms ?
Responda
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paralysis of left side of face and left upper extremity
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paralysis of left lower extremity
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complete loss of vision in both eyes
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loss of ability to comprehend speech
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loss of vision in left eye
Questão 9
Questão
the withdrawal reflex is initiated by stimulation delivered to which of the following receptors?
Responda
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muscle spindle
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joint capsule receptor
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cutaneous free nerve ending
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golgi tendon organ
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pacinian corpuscle
Questão 10
Questão
paralysis can result from physical damage to the spinal cord Examples of extensive damage to the spinal cord are :
Responda
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quadriplegia
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paraplegia
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planter reflex
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A & B only
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None of the above
Questão 11
Questão
function of cerbellar neurons is,
Responda
-
basket cells evoke excitatory response in purkinje cells
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granule cells evoke excitatory response in purkinje cells
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golgi cells evoke excitatory response in basket cells
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purkinje cells evoke excitatory responses in cerebellar nuclear cells
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stellate cells evoke excitatory responses in basket cells
Questão 12
Questão
regarding to basal ganglia in motor control :
Responda
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disorder of the basal ganglia produces a marked loss of both sensation and motor control
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parkinsonism is caused by neuronal degeneration within the substantia nigra
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the globus pallidus projects directly to the cerebral cortex
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site of intiation of fine movement
Questão 13
Questão
which of the following terms describes the cerebellar deficit in which there is failure to perform rapid alternating movement:
Responda
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past pointing
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intention tremor
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dysarthia
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cerebellar nystagmus
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dysdiadokokinesia
Questão 14
Questão
concerning muscle spindle :
Responda
-
primary afferents arise from nuclear chain fibers only
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secondery endings arise from both nuclear bag and nuclear chain
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primary afferent belongs to type Ib fibers
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primary afferent has the highest conduction velocity in the body
Questão 15
Questão
activation of gamma motor neuron :
Responda
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causes relaxation of extrafusal muscle fibers
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causes the contraction of intrafusal muscle fibers
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makes the muscle spindle more sensitive to stretch
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relax the muscle spindle
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a , b & c
Questão 16
Questão
regarding upper motor neuron :
Responda
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it originates from the anterior horn
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its chronic lesion causes falccid paralysis
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fibrellation is common with its lesion
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its lesion is associated with clasp-knife pattern of hypertonia
Questão 17
Questão
in generation of motor act :
Responda
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area 4 responsible for planning
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area 6 and basal ganglia help in planning
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spino-cerebellum helps in planning
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lateral cerebellum adjust the ongoing movement
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generation of idea occurs in the occibital lobe
Questão 18
Questão
in basal ganglia :
Responda
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activity in the direct pathway results in increased thalamo-cortical activity
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dopamine activate the indirect pathway
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globus pallidus externa is a part of the direct pathway
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acetyl-choline activates the direct pathway
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parkinsonism associated with increased activity in the direct pathway
Questão 19
Questão
ataxia is defined as :
Responda
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inability to perform rapidly alternating movements
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error in the range of movement
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lack lack of continuity in the execution of movements
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error in the rate , force and direction of movement
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weakness
Questão 20
Questão
walking is controlled by groups of neurons of the spinal cord called :
Responda
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nuclea and ganglia
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the limbic system
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central pattern generators
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dorsal and ventral horns
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corticospinal tract
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