Free Neurophysiology MCQs with Answers
64 Neurophysiology MCQs from Physiology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. GABA
- B. Glutamate
- C. Aspartic acid
- D. Lysin
Explanation: GABA is the principal inhibitory neurotransmitter in the brain, usually reducing neuronal excitability by increasing chloride or potassium…
Correct answer: GABA- A. Vagus nerve
- B. Facial nerve
- C. Trigeminal nerve
- D. Glossopharyngeal nerve
Explanation: The afferent limb of the corneal reflex travels through the ophthalmic division of the trigeminal nerve, while the efferent blinking…
Correct answer: Trigeminal nerve- A. Reticulospinal
- B. Vestibulospinal
- C. Rubrospinal
- D. Corticospinal
Explanation: The corticospinal tract is a pyramidal tract involved in voluntary skilled movement.
Correct answer: Corticospinal- A. Sympathetic nerves
- B. Parasympathetic nerves
- C. Sensory nerves
- D. Motor nerves
Explanation: Sweat glands receive sympathetic autonomic fibres, but unlike most sympathetic postganglionic fibres, these release acetylcholine rather…
Correct answer: Sympathetic nerves- A. Deuteranopia
- B. Protanopia
- C. Protanomaly
- D. Deuteranomaly
Explanation: Protanopia is absence of the red-sensitive L cone and causes red colour blindness.
Correct answer: Protanopia- A. Astrocytes
- B. Schwann cells
- C. Oligocytes
- D. Microglia
Explanation: Microglia are the resident macrophage-like cells of the CNS, so they remove cellular debris and phagocytose pathogens.
Correct answer: Microglia- A. Neuronal inhibition
- B. Neuronal activation
- C. Glial cell inhibition
- D. Glial cell activation
Explanation: GABA is the major inhibitory neurotransmitter in the CNS; it usually reduces neuronal excitability by increasing chloride entry or…
Correct answer: Neuronal inhibition- A. Motor areas of cerebral cortex
- B. Basal ganglia complex
- C. Pathways for recurrent collateral inhibition in the spinal cord
- D. Anterior hypothalamus
Explanation: Chorea and athetosis are hyperkinetic movement disorders caused by dysfunction of the basal ganglia circuits, which normally help regulate…
Correct answer: Basal ganglia complex- A. Touch
- B. Temperature
- C. Muscle sense
- D. Vibration sense
Explanation: A hemisection of the spinal cord causes ipsilateral loss of vibration, position and fine touch, while pain and temperature are lost on the…
Correct answer: Temperature- A. Schwan cell mitosis
- B. Axonal sprouting
- C. Nuclear disintegration
- D. Myelin sheath degeneration
Explanation: After a nerve is cut, the distal axon and its myelin undergo Wallerian degeneration, with myelin breakdown occurring before Schwann-cell…
Correct answer: Myelin sheath degeneration- A. Nuclear bag intrafusal fibers
- B. Nuclear chain
- C. Golgi tendon organ
- D. Pacinium corpuscles
Explanation: The primary endings of nuclear bag intrafusal fibres are especially sensitive to the rate of muscle stretch, producing the dynamic…
Correct answer: Nuclear bag intrafusal fibers- A. Disintegrating of Nucleus
- B. Disappearance of nissel granules
- C. Disintegration of golgi apparatus
- D. Decrease in cell size
Explanation: Chromatolysis is the loss or dispersal of Nissl bodies in a neuron after axonal injury, accompanied by swelling of the cell body.
Correct answer: Disappearance of nissel granules- A. Schwann cells
- B. Astrocytes
- C. Oligodendrocytes
- D. Microglia
Explanation: Oligodendrocytes form myelin around axons in the CNS, with one cell capable of myelinating segments of several axons.
Correct answer: Oligodendrocytes- A. Lateral walls
- B. Nasal septum
- C. Lateral wall and nasal septum above superior concha
- D. None of the above
Explanation: Olfactory receptors lie in the olfactory epithelium at the roof of the nasal cavity, including the upper nasal septum and the lateral wall…
Correct answer: Lateral wall and nasal septum above superior concha- A. Midbrain
- B. Hypothalamus
- C. Cerebrum
- D. Pons
Explanation: The hypothalamus is the major integrating centre for autonomic activity, linking visceral control with endocrine and behavioural…
Correct answer: Hypothalamus- A. Intrafusal fibers of the muscle spindle
- B. Golgi tendon apparatus
- C. Autoonomic preganglionic fibers
- D. Spinothalamic tracts
Explanation: Group B fibres are small, myelinated fibres that include autonomic preganglionic axons.
Correct answer: Autoonomic preganglionic fibers- A. Medulla
- B. Precentral gyrus
- C. Diencephalon
- D. Hypothalamus
Explanation: The hypothalamus maintains body temperature by comparing thermal input with a set point and activating heat-loss or heat-production…
Correct answer: Hypothalamus- A. Babinsky test
- B. Weber's test
- C. Finger - nose test
- D. Chvostek test
Explanation: Weber's test uses a tuning fork placed on the midline of the skull to compare sound lateralisation and is useful for detecting conductive…
Correct answer: Weber's test- A. Trigeminal nerve ganglion
- B. Otic ganglion
- C. Geniculate ganglion
- D. Superior cervical ganglion
Explanation: Taste fibres from the anterior two-thirds of the tongue travel with the chorda tympani branch of the facial nerve, whose sensory cell…
Correct answer: Geniculate ganglion- A. Temporal lobe
- B. Stria nigra
- C. Frontal lobe
- D. Hypothalamus
Explanation: The hypothalamus contains feeding centres that regulate hunger and satiety, classically described as a lateral hunger centre and a…
Correct answer: Hypothalamus