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Physiology Motor

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Quiz by #أطباء_2020 , updated more than 1 year ago
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Quiz on Physiology Motor, created by #أطباء_2020 on 16/01/2015.

Resource summary

Question 1

Question
regarding reflexes :
Answer
  • a monosynaptic reflex arc involves one or more interneurons
  • the knee jerk reflex is an example of a stretch reflex
  • interneurons are the final common path for all reflexes
  • withdrawal reflexes are lost following cervical section of spinal cord
  • none of the above

Question 2

Question
motor impulses are transmitted by :
Answer
  • dorsal root of spinal nerves
  • dorsal root ganglia of spinal nerves
  • ventral roots of spinal nerves
  • none of above
  • all of the above

Question 3

Question
which of the following is the type of neuron whose axons forms synaptic junctions with sk. muscle cells "intrafusal fibers" within the muscle spindles ?
Answer
  • alpha motor neurons
  • pyramidal neurons
  • gamma motor neurons
  • granule cells
  • purkinje cells

Question 4

Question
which of the following types of neurons is the efferent of nuclear bag intrafusal fibers that signal a change in muscle length ?
Answer
  • static gamma motor neurons
  • alpha motor neurons
  • dynamic gamma motor neurons
  • corticospinal neuron
  • renshaw cell

Question 5

Question
which of the following receive direct synaptic input from Golgi tendon organs ?
Answer
  • type Ia inhibitory interneurons
  • dynamic gamma motor neurons
  • alpha motor neurons
  • type Ib inhibitory interneurons
  • type II excitatory interneurons

Question 6

Question
concerning motor cortex :
Answer
  • the motor areas of the cortex are situated in the postcentral gyrus
  • following a cerebral haemorrhage affecting the precentral gyrusof the right hemisphere , the patient feels no sensations on left side of the body
  • the corticospinal tract provides the only connection between the motor cortical areas and the spinal cord
  • motor areas of the cortex receive somatosensory input via the thalamus

Question 7

Question
which statement concerning the premotor cortex is correct ?
Answer
  • the premotor cortex is located just posterior to the primary cortex
  • the lateral to medial sequenc in the somatotopic organization of premotor cortex is the reserve of that seen in the primary motor cortex
  • stimulation of a small discrete group of neurons in the premotor cortex produces contraction of an individual muscle
  • stimulation of the premotor cortex does not lead to any muscle activation
  • the premotor cortex sets the specefic posture required for the limb to produce the desired movement

Question 8

Question
a stroke involving the middle cerebral artery on the left side is likely to cause which of the following symptoms ?
Answer
  • paralysis of left side of face and left upper extremity
  • paralysis of left lower extremity
  • complete loss of vision in both eyes
  • loss of ability to comprehend speech
  • loss of vision in left eye

Question 9

Question
the withdrawal reflex is initiated by stimulation delivered to which of the following receptors?
Answer
  • muscle spindle
  • joint capsule receptor
  • cutaneous free nerve ending
  • golgi tendon organ
  • pacinian corpuscle

Question 10

Question
paralysis can result from physical damage to the spinal cord Examples of extensive damage to the spinal cord are :
Answer
  • quadriplegia
  • paraplegia
  • planter reflex
  • A & B only
  • None of the above

Question 11

Question
function of cerbellar neurons is,
Answer
  • basket cells evoke excitatory response in purkinje cells
  • granule cells evoke excitatory response in purkinje cells
  • golgi cells evoke excitatory response in basket cells
  • purkinje cells evoke excitatory responses in cerebellar nuclear cells
  • stellate cells evoke excitatory responses in basket cells

Question 12

Question
regarding to basal ganglia in motor control :
Answer
  • disorder of the basal ganglia produces a marked loss of both sensation and motor control
  • parkinsonism is caused by neuronal degeneration within the substantia nigra
  • the globus pallidus projects directly to the cerebral cortex
  • site of intiation of fine movement

Question 13

Question
which of the following terms describes the cerebellar deficit in which there is failure to perform rapid alternating movement:
Answer
  • past pointing
  • intention tremor
  • dysarthia
  • cerebellar nystagmus
  • dysdiadokokinesia

Question 14

Question
concerning muscle spindle :
Answer
  • primary afferents arise from nuclear chain fibers only
  • secondery endings arise from both nuclear bag and nuclear chain
  • primary afferent belongs to type Ib fibers
  • primary afferent has the highest conduction velocity in the body

Question 15

Question
activation of gamma motor neuron :
Answer
  • causes relaxation of extrafusal muscle fibers
  • causes the contraction of intrafusal muscle fibers
  • makes the muscle spindle more sensitive to stretch
  • relax the muscle spindle
  • a , b & c

Question 16

Question
regarding upper motor neuron :
Answer
  • it originates from the anterior horn
  • its chronic lesion causes falccid paralysis
  • fibrellation is common with its lesion
  • its lesion is associated with clasp-knife pattern of hypertonia

Question 17

Question
in generation of motor act :
Answer
  • area 4 responsible for planning
  • area 6 and basal ganglia help in planning
  • spino-cerebellum helps in planning
  • lateral cerebellum adjust the ongoing movement
  • generation of idea occurs in the occibital lobe

Question 18

Question
in basal ganglia :
Answer
  • activity in the direct pathway results in increased thalamo-cortical activity
  • dopamine activate the indirect pathway
  • globus pallidus externa is a part of the direct pathway
  • acetyl-choline activates the direct pathway
  • parkinsonism associated with increased activity in the direct pathway

Question 19

Question
ataxia is defined as :
Answer
  • inability to perform rapidly alternating movements
  • error in the range of movement
  • lack lack of continuity in the execution of movements
  • error in the rate , force and direction of movement
  • weakness

Question 20

Question
walking is controlled by groups of neurons of the spinal cord called :
Answer
  • nuclea and ganglia
  • the limbic system
  • central pattern generators
  • dorsal and ventral horns
  • corticospinal tract
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