3 MCQs in Anatomy for NEET PG
Which glial cell type is responsible for myelination in the peripheral nervous system?
A 52-year-old man from Delhi presents with progressive weakness and fasciculations in his lower limbs over 3 months. Electromyography shows denervation potentials and fibrillations. A muscle biopsy from the vastus lateralis is performed. Histological examination reveals groups of atrophic muscle fibres interspersed with normal or hypertrophied fibres in a checkerboard pattern. Which of the following histological findings in the motor neurons of the anterior horn would best explain these muscle changes?
Which structural feature distinguishes unmyelinated axons in the peripheral nervous system from myelinated axons?
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