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Neuroanatomy MCQs Cram Sheet 1



Q1. The “Nissl substance” represents which organelle of neuron?
A. Golgi complex
B. Nucleolus
C. Rough endoplasmic reticulum
D. Mitochondria

Ans: The cytoplasm of a neuron shows the presence of a granular material that stains intensely with basic dyes called Nissl substance (also called Nissl bodies or granules) . These bodies are rough endoplasmic reticulum

Q2. Which of the following provides myelin sheath to the axons of the CNS?
A. Astrocytes
B. Oligodendrocytes
C. Microglia
D. Ependymocytes

Ans: Oligodendrocytes form myelin sheath in CNS. Schwann cells form myelin sheath in PNS

Q3. The perivascular foot of the “blood–brain barrier” is an extension from the:
A. Oligodendrocyte
B. Ependymocyte
C. Astrocyte
D. Microglia

Ans: Astrocytes form the perivascular feet around a capillary. Astrocytes act as insulators, nourish the neurons, help form blood-brain barrier.

Q4. Sensation of pain is detected by:A. Mechanoreceptor
B. Chemoreceptor
C. Nociceptor
D. Thermoreceptor



Ans: Nociceptor

Q5. The cerebral aqueduct is developed from the cavity of:A. Rhombencephalon
B. Mesencephalon
C. Telencephalon
D. Diencephalon



Ans: The cavity of each telencephalic vesicle becomes the lateral ventricle. The cavity of  iencephalon (along with the central part of the telencephalon) becomes the third ventricle. The cavity of the mesencephalon remains narrow, and forms the cerebral aqueduct (aqueduct of Sylvius). The cavity of the rhombencephalon forms the fourth ventricle. Its continuation in the spinal cord is the
central canal


Q6. The failure of closure of the cranial end of neural tube gives rise to:A. Anencephaly
B. Hydrocephalus
C. Microcephaly
D. Meningomyelocoele


Ans: The neural tube remains open in the region of the brain because of nonclosure of the anterior neuropore. This results in anencephaly. Brain tissue, which is exposed, degenerates

Q7. By which week of intrauterine life does the neural tube close?
A. Fourth
B. Fifth
C. Sixth
D. Seventh


Ans: At 4 weeks the neural tube is normally completely closed (Ref: https://embryology.med.unsw.edu.au/embryology/index.php/Timeline_human_development#Neural)

Q8. The cervical flexure of the neural tube occurs:A. Between the forebrain and midbrain
B. In the midbrain
C. Between hindbrain and spinal cord
D. In the hindbrain
 

Ans: The cervical flexure lies at the junction of the rhombencephalon and the spinal cord  


Q9:Rabies virus, from the site of bite, travels along nerves by 
A. Forward Axoplasmic Flow
B: Reverse Axoplasmic flow
C: Dendritic Flow
D: Along the Endoneurium of nerve fibres


Ans: Rabies virus, from the site of bite, travels along nerves by reverse axoplasmic flow.

Q10:Polio virus is also transported from the gastrointestinal tract through :


A. Forward Axoplasmic Flow
B: Reverse Axoplasmic flow
C: Dendritic Flow
D: Along the Endoneurium of nerve fibres

Ans: Polio virus is also transported from the gastrointestinal tract through reverse axoplasmic flow.


Q11:Tetanus bacteria, in contrast, travels from the site of infection to the brain by:
A. Forward Axoplasmic Flow
B: Reverse Axoplasmic flow
C: Dendritic Flow
D: Along the Endoneurium of nerve fibres

Ans: Tetanus bacteria travels from the site of infection to the brain along the endoneurium of nerve fibres
  
Reference:

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