MCQs on CNS physiology for 2nd year mbbs

1. Department of Physiology
CNS MCQs
1. One of the following is encapsulated rapidly adapting receptor
A. Merkels Disc
B. Free nerve endings
C. Ruffinis endings
D. Pacinian corpuscles
2. Weber-Fechners law relates the strength of the stimulus
A. Strength of the muscle contraction
B. Duration of stimulus
C. Frequency of Action Potential
D. Amplitude of Action Potential
3. If there is loss of vibration in the face, the tract damaged is
A. Spinocerebellar tract
B. Spinothalamic tract
C. Trigeminal pathway
D. Tract of Gracilis and Cuneatus
4. The neurotransmitters released by PAG are
A. Enkephalin & Endorphin
B. Serotonin & substance-P
C. Glutamate & Aspartate
D. GABA & Glycine
5. According to gate control theory, the gate cell (neuron) is
A. Dorsal horn cell
B. Interneuron of SGR
C. Lateral horn cell
D. Neuron of final common pathway
6. Cerebral cortical representation is characterized by all of the following EXCEPT
A. Contralateral body mapping
B. Inverted representation
C. Proportional to density of sensory or motor units
D. Ipsilateral representation of face
7. The characteristics feature of the pyramidal tract is
A. 20% of fibres cross
B. 60% of the fibres originate from primary motor cortex
C. 20% of the fibres show segmental intercrossing
D. 80% of the fibres do not cross

2. 8. Upper motor neuron is
A. Stellate cell of II layer of cerebral cortex
B. Pyramidal neuron of V layer
C. Interneuron of III layer
D. Sensory interneuron of IV layer
9. Alpha motor neuron is NOT among one of the following
A. Lower motor neuron
B. Final common pathway
C. Present in the anterior horn cell
D. Innervates the Intrafusal fibres
10. One of the following does not belong to basal (subcortical) nuclei
A. Putamen
B.Globus pallidus
C. Substantia Nigra
D. Red nucleus
11. Blood brain barrier is the contact between
A. Astrocyte and capillary endothelium
B. Astrocyte and oligodendrocyte
C. Oligodendrocyte and capillary endothelium
D. Capillary endothelium and neuronal processes
12.Cerebrospinal fluid is formed in the
A. Choroid plexus
B. Arachanoid granulations
C. Nerve cell body
D. Axonal terminal
13. Parallel fibers create negative feedback loop with
A. Golgi cell
B. Purkinje cell
C. Stellate cell
D. Basket cell
14. Festinant gait is the characteristic feature of
A. Cerebellar disorder
B. Parkinson’s disease
C. Hemiplegia
D.Alchoholism
15. Sensory transduction refers mainly to
A. Production of generator potential at the receptor membrane
B. Propagation of action potential along the peripheral nerve

3. C. Potentiation of the process at the spinal cord
D. Perception at the cerebral cortex
16. White matter components restricted to cerebral hemisphere of the same side is/ or
A. Association fibers
B. Projection fibers
C. Commissural fibers
D. All of the above
17. All the following are found in the grey matter EXCEPT
A. Cell body of a neuron
B. Dendrites
C. Myelinated axons
D. Synapses
18. Brown –Sequard syndrome is characterized by Contralateral
A. Loss of pain and temperature
B. Loss of pressure and vibration
C. Motor deficit
D. Ataxia
19. The neurotransmitters are
A. Produced and processed in the neuroglia
B. Released at the axon hillock
C. Interacting with postsynaptic receptors
D. Secreted in the post synaptic neuron directly.
20. The myelination
A. Starts after the birth
B. Starts and ends in the fetal life
C. Is directly related to conduction velocity
D Inversely related to thickness of the fiber
21. Muscle spindles
A. Are not capsulated
B. Are equipped with extrafusal fibers
C. Show presence of nuclear bag fibers
D. Are innervated by alpha motor neuron
22. One of the following is monosynaptic reflex
A. Stretch reflex
B Inverse stretch reflex
C Crossed extensor reflex
D Mass reflex