Quiz
Physiology Motor
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Questions in this quiz (20)
1regarding reflexes :
- Aa monosynaptic reflex arc involves one or more interneurons
- Bthe knee jerk reflex is an example of a stretch reflex
- Cinterneurons are the final common path for all reflexes
- Dwithdrawal reflexes are lost following cervical section of spinal cord
- Enone of the above
- Aa monosynaptic reflex arc involves one or more interneurons
2motor impulses are transmitted by :
- Adorsal root of spinal nerves
- Bdorsal root ganglia of spinal nerves
- Cventral roots of spinal nerves
- Dnone of above
- Eall of the above
- Adorsal root of spinal nerves
3which of the following is the type of neuron whose axons forms synaptic junctions with sk. muscle cells "intrafusal fibers" within the muscle spindles ?
- Aalpha motor neurons
- Bpyramidal neurons
- Cgamma motor neurons
- Dgranule cells
- Epurkinje cells
- Aalpha motor neurons
4which of the following types of neurons is the efferent of nuclear bag intrafusal fibers that signal a change in muscle length ?
- Astatic gamma motor neurons
- Balpha motor neurons
- Cdynamic gamma motor neurons
- Dcorticospinal neuron
- Erenshaw cell
- Astatic gamma motor neurons
5which of the following receive direct synaptic input from Golgi tendon organs ?
- Atype Ia inhibitory interneurons
- Bdynamic gamma motor neurons
- Calpha motor neurons
- Dtype Ib inhibitory interneurons
- Etype II excitatory interneurons
- Atype Ia inhibitory interneurons
6concerning motor cortex :
- Athe motor areas of the cortex are situated in the postcentral gyrus
- Bfollowing a cerebral haemorrhage affecting the precentral gyrusof the right hemisphere , the patient feels no sensations on left side of the body
- Cthe corticospinal tract provides the only connection between the motor cortical areas and the spinal cord
- Dmotor areas of the cortex receive somatosensory input via the thalamus
- Athe motor areas of the cortex are situated in the postcentral gyrus
7which statement concerning the premotor cortex is correct ?
- Athe premotor cortex is located just posterior to the primary cortex
- Bthe lateral to medial sequenc in the somatotopic organization of premotor cortex is the reserve of that seen in the primary motor cortex
- Cstimulation of a small discrete group of neurons in the premotor cortex produces contraction of an individual muscle
- Dstimulation of the premotor cortex does not lead to any muscle activation
- Ethe premotor cortex sets the specefic posture required for the limb to produce the desired movement
- Athe premotor cortex is located just posterior to the primary cortex
8a stroke involving the middle cerebral artery on the left side is likely to cause which of the following symptoms ?
- Aparalysis of left side of face and left upper extremity
- Bparalysis of left lower extremity
- Ccomplete loss of vision in both eyes
- Dloss of ability to comprehend speech
- Eloss of vision in left eye
- Aparalysis of left side of face and left upper extremity
9the withdrawal reflex is initiated by stimulation delivered to which of the following receptors?
- Amuscle spindle
- Bjoint capsule receptor
- Ccutaneous free nerve ending
- Dgolgi tendon organ
- Epacinian corpuscle
10paralysis can result from physical damage to the spinal cord Examples of extensive damage to the spinal cord are :
- Aquadriplegia
- Bparaplegia
- Cplanter reflex
- DA & B only
- ENone of the above
11function of cerbellar neurons is,
- Abasket cells evoke excitatory response in purkinje cells
- Bgranule cells evoke excitatory response in purkinje cells
- Cgolgi cells evoke excitatory response in basket cells
- Dpurkinje cells evoke excitatory responses in cerebellar nuclear cells
- Estellate cells evoke excitatory responses in basket cells
12regarding to basal ganglia in motor control :
- Adisorder of the basal ganglia produces a marked loss of both sensation and motor control
- Bparkinsonism is caused by neuronal degeneration within the substantia nigra
- Cthe globus pallidus projects directly to the cerebral cortex
- Dsite of intiation of fine movement
- Adisorder of the basal ganglia produces a marked loss of both sensation and motor control
13which of the following terms describes the cerebellar deficit in which there is failure to perform rapid alternating movement:
- Apast pointing
- Bintention tremor
- Cdysarthia
- Dcerebellar nystagmus
- Edysdiadokokinesia
- Apast pointing
14concerning muscle spindle :
- Aprimary afferents arise from nuclear chain fibers only
- Bsecondery endings arise from both nuclear bag and nuclear chain
- Cprimary afferent belongs to type Ib fibers
- Dprimary afferent has the highest conduction velocity in the body
- Aprimary afferents arise from nuclear chain fibers only
15activation of gamma motor neuron :
- Acauses relaxation of extrafusal muscle fibers
- Bcauses the contraction of intrafusal muscle fibers
- Cmakes the muscle spindle more sensitive to stretch
- Drelax the muscle spindle
- Ea , b & c
- Acauses relaxation of extrafusal muscle fibers
16regarding upper motor neuron :
- Ait originates from the anterior horn
- Bits chronic lesion causes falccid paralysis
- Cfibrellation is common with its lesion
- Dits lesion is associated with clasp-knife pattern of hypertonia
- Ait originates from the anterior horn
17in generation of motor act :
- Aarea 4 responsible for planning
- Barea 6 and basal ganglia help in planning
- Cspino-cerebellum helps in planning
- Dlateral cerebellum adjust the ongoing movement
- Egeneration of idea occurs in the occibital lobe
- Aarea 4 responsible for planning
18in basal ganglia :
- Aactivity in the direct pathway results in increased thalamo-cortical activity
- Bdopamine activate the indirect pathway
- Cglobus pallidus externa is a part of the direct pathway
- Dacetyl-choline activates the direct pathway
- Eparkinsonism associated with increased activity in the direct pathway
- Aactivity in the direct pathway results in increased thalamo-cortical activity
19ataxia is defined as :
- Ainability to perform rapidly alternating movements
- Berror in the range of movement
- Clack lack of continuity in the execution of movements
- Derror in the rate , force and direction of movement
- Eweakness
- Ainability to perform rapidly alternating movements
20walking is controlled by groups of neurons of the spinal cord called :
- Anuclea and ganglia
- Bthe limbic system
- Ccentral pattern generators
- Ddorsal and ventral horns
- Ecorticospinal tract
- Anuclea and ganglia
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- Quiz on Physiology Motor, created by #أطباء_2020 on 16/01/2015.
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