Final answer:
Cajal-Retzius cells are crucial for brain development, assisting in neuron migration through reelin secretion. Satellite glial cells stem from the neural crest during embryogenesis and insulate neuronal cell bodies within sensory ganglia.
Step-by-step explanation:
Cajal-Retzius cells are neurons located in the marginal layer of the developing cerebral cortex. They play a critical role in the development of the cerebral cortex, primarily through the secretion of reelin, an extracellular matrix protein that regulates the migration and positioning of neurons. These cells originate from specific regions in the developing brain, such as the pallium and the cortical hem, and migrate horizontally across the developing cortex. The migration process is complex and involves the interaction of Cajal-Retzius cells with the extracellular matrix and other cells through cell adhesion molecules and guiding cues.
During embryologic development, satellite glial cells derive from the neural crest. These cells eventually become part of the peripheral nervous system wrapping around neuronal cell bodies within sensory ganglia such as the dorsal root ganglion, providing support and insulation.