Differentiate radial migration from tangential migration with examples.

Differentiate radial migration from tangential migration with examples.

• A. Radial migration moves neurons outward along radial glia, such as excitatory cortical neurons.
• B. Tangential migration moves neurons outward along radial glia.
• C. Radial migration moves interneurons from ganglionic eminences to the cortex.
• D. Tangential migration forms cortical neurons that become astrocytes.

Answer: (A)

Radial migration moves neurons outward from the ventricular zone toward the cortical plate along the long, radial glial fibers that span the developing cortex. A classic example is excitatory cortical neurons, which are born near the ventricles and climb along these glial guides to settle in the appropriate cortical layers. Tangential migration, on the other hand, travels parallel to the brain surface, allowing cells to move long distances across regions without moving outward from the ventricle. A key example is interneurons produced in the ganglionic eminences of the ventral forebrain that migrate across the cortex in a tangential fashion to populate inhibitory circuits. The statement identifies radial migration correctly and with a fitting example—outward movement along radial glia to form cortical neurons. The other ideas mix up the directions and cell types: tangential migration does not move along radial glia; interneurons typically migrate tangentially rather than radially; and migration of neurons is distinct from glial differentiation such as astrocyte formation.

Radial migration moves neurons outward from the ventricular zone toward the cortical plate along the long, radial glial fibers that span the developing cortex. A classic example is excitatory cortical neurons, which are born near the ventricles and climb along these glial guides to settle in the appropriate cortical layers.

Tangential migration, on the other hand, travels parallel to the brain surface, allowing cells to move long distances across regions without moving outward from the ventricle. A key example is interneurons produced in the ganglionic eminences of the ventral forebrain that migrate across the cortex in a tangential fashion to populate inhibitory circuits.

The statement identifies radial migration correctly and with a fitting example—outward movement along radial glia to form cortical neurons. The other ideas mix up the directions and cell types: tangential migration does not move along radial glia; interneurons typically migrate tangentially rather than radially; and migration of neurons is distinct from glial differentiation such as astrocyte formation.