Where are cortical interneurons primarily generated, and how do they reach the cortex?

Where are cortical interneurons primarily generated, and how do they reach the cortex?

• A. Generated in the ventricular zone of the cortex and migrate radially
• B. Generated in the thalamus and migrate to the cortex
• C. Generated in the hippocampus and migrate radially
• D. Generated in the ganglionic eminences and migrate tangentially to the cortex

Answer: (D)

Cortical interneurons come from the ventral forebrain, specifically the ganglionic eminences, not from the cortex itself. They migrate into the developing cortex along tangential paths within the subpallium, rather than moving straight outward from the ventricular zone. Once they arrive in the cortex, they disperse and then switch to radial movement to settle into their final positions across the cortical layers, differentiating as diverse inhibitory (GABAergic) interneurons. This stands in contrast to excitatory neurons, which are born in the dorsal telencephalon’s ventricular zone and migrate radially to the cortex.

Cortical interneurons come from the ventral forebrain, specifically the ganglionic eminences, not from the cortex itself. They migrate into the developing cortex along tangential paths within the subpallium, rather than moving straight outward from the ventricular zone. Once they arrive in the cortex, they disperse and then switch to radial movement to settle into their final positions across the cortical layers, differentiating as diverse inhibitory (GABAergic) interneurons. This stands in contrast to excitatory neurons, which are born in the dorsal telencephalon’s ventricular zone and migrate radially to the cortex.