Which of the following is NOT one of the four neuron types migrating to the cortex?

Which of the following is NOT one of the four neuron types migrating to the cortex?

• A. Purkinje cells
• B. Golgi cells
• C. Basket cells
• D. Pyramidal cells

Answer: (D)

Neuronal migration to the cortex follows specific developmental routes. Pyramidal neurons are the main excitatory cells of the cerebral cortex and originate in the ventricular zone of the dorsal telencephalon. They migrate radially outward into the cortical plate to form the six cortical layers. Interneurons, like basket cells, come from subcortical regions (the ganglionic eminences) and migrate tangentially into the cortex to populate local circuits. Purkinje cells and Golgi cells, however, are hallmark neurons of the cerebellar cortex; they migrate to the cerebellum rather than the cerebral cortex and do not become part of the cerebral cortical circuitry. So, if the question is about which neuron type does not migrate to the cerebral cortex, Purkinje or Golgi would be the correct distinctions. Pyramidal cells, in contrast, do migrate to the cerebral cortex, so they would not be the NOT-migrating choice. The apparent discrepancy in the given answer reflects this distinction between cerebral and cerebellar cortical development.

Neuronal migration to the cortex follows specific developmental routes. Pyramidal neurons are the main excitatory cells of the cerebral cortex and originate in the ventricular zone of the dorsal telencephalon. They migrate radially outward into the cortical plate to form the six cortical layers. Interneurons, like basket cells, come from subcortical regions (the ganglionic eminences) and migrate tangentially into the cortex to populate local circuits. Purkinje cells and Golgi cells, however, are hallmark neurons of the cerebellar cortex; they migrate to the cerebellum rather than the cerebral cortex and do not become part of the cerebral cortical circuitry. So, if the question is about which neuron type does not migrate to the cerebral cortex, Purkinje or Golgi would be the correct distinctions. Pyramidal cells, in contrast, do migrate to the cerebral cortex, so they would not be the NOT-migrating choice. The apparent discrepancy in the given answer reflects this distinction between cerebral and cerebellar cortical development.