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A 32-year-old male presents with a six-month history of progressive weakness in his lower limbs, accompanied by numbness and tingling sensations. Neurological examination reveals bilateral lower extremity weakness with hyperreflexia and impaired sensation in a stocking-glove distribution. MRI of the brain and spinal cord shows multiple white matter lesions consistent with demyelination. Further testing reveals the presence of antimyeloma antibodies. Which cells are primarily affected by the presence of these antimyeloma antibodies?
- Oligodendrocytes
- Microglia
- Astrocytes
- Neurons
- Schwann cells
- Ependymal cells – Correct Answer - A) Oligodendrocytes
A 34-year-old man presents with a 3-day history of fever, headache, and behavioral changes. MRI of the brain reveals hyperintensities in the bilateral medial temporal lobes. Further molecular analysis reveals that a viral protein has disrupted axonal trafficking of neurotrophic factors from peripheral axon terminals to the cell body. Which of the following is most likely impaired in this patient’s neurons?
- Dysfunctional kinesin motor proteins 1 / 4
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- Demyelination due to loss of Schwann cells
- Dysfunctional dynein motor proteins
- Demyelination due to loss of oligodendrocytes
- Hyperphosphorylation of tubulin – Correct Answer - C. Dysfunctional
dynein motor proteins
A 45-year-old patient presents with symptoms of muscle weakness and paralysis after exposure to a neurotoxin. The toxin is known to affect the transport mechanism within neurons. Which protein is responsible for the retrograde transport of toxins from the axon terminal to the neuron cell body?
- Kinesin
- Dynein
- Tubulin
- Actin
- Neurofilaments – Correct Answer - B) Dynein
A newly discovered virus has been found to interfere with cellular processes by affecting the retrograde transport mechanism. Researchers are investigating the virus's mechanism of action to develop potential treatments. Which of the following mechanisms is the most plausible explanation for how this virus disrupts retrograde transport?
- Inhibition of kinesin motor proteins
- Disruption of actin polymerization
- Activation of myosin motor proteins
- Degradation of dynein motor proteins 2 / 4
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- Promotion of endosome fusion – Correct Answer - D) Degradation of
dynein motor proteins
A 55-year-old male patient presents with symptoms suggestive of peripheral neuropathy, including numbness and tingling in the distal extremities, muscle weakness, and loss of reflexes. Further evaluation reveals impaired transport of neurotrophic factors to the cell body of neurons, leading to degeneration of sensory and motor neurons. Which protein is primarily involved in the transport of neurotrophic factors to the neuron cell body?
- Neurofilaments
- Kinesin
- Dynein
- Tubulin
- Actin – Correct Answer - C) Dynein
Involved in the transport of NGF, used materials from axon terminals to soma for degradation/recycling worn out organelles. Neurotropic virus.
A 28-year-old woman presents with a 3-month history of chronic burning pain in her left foot, which worsens at night and is exacerbated by light touch. Neurological examination reveals allodynia and hyperalgesia in the affected area. Skin biopsy reveals a reduced intraepidermal unmyelinated nerve fiber density. Which of the following best characterizes the fibers mediating this response?
- A-alpha fibers
- Skin afferent from nociceptors
- Afferent fiber from Golgi tendon organ 3 / 4
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- Preganglionic parasympathetic fibers
- Type II touch and pressure afferents
- Skin afferent from nociceptors. – Correct Answer - A afferent nerve
fibers
A 55-year-old male presents to the emergency department following a motorcycle accident. He sustained a significant injury to his right arm, resulting in a laceration of the brachial plexus. Upon examination, he demonstrates weakness and loss of sensation in the distribution of his radial nerve. The patient undergoes surgical repair of the damaged nerve.Which of the following plays a crucial role in regeneration of this nerve?
a) Oligodendrocytes
b) Endoneurium
c) Astrocytes
d) Schwann cells
e) Microglia – Correct Answer - d) Schwann cells
A 68-year-old woman with type 2 diabetes mellitus comes to the physician for her annual foot examination. Neurologic examination shows absent sensation to the vibration of a standardized 128-Hz tuning fork bilaterally over the metatarsophalangeal joints. Sensation to vibration is normal over the upper extremities. When constant vibration is applied to the upper extremity, the patient adapts rapidly to this stimulus. Which of the following types of sensory receptors is most likely activated by this examination technique?
- Meissner corpuscles
- Ruffini corpuscles
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