Cajal–Retzius Cells

Cajal–Retzius Cells are specialized neurons found in the developing cerebral cortex during early embryonic stages. Named after the pioneering neuroscientists Santiago Ramón y Cajal and Gustaf Retzius, these cells play a crucial role in cortical layer formation and neuronal migration. Cajal–Retzius cells are primarily located in the marginal zone of the developing cortex, where they secrete reelin, a glycoprotein essential for proper neuronal migration and layer organization. Reelin guides migrating neurons to their appropriate positions within the developing cortex, influencing the establishment of distinct cortical layers. The presence of Cajal–Retzius cells is transient, diminishing as the cortex matures. However, their impact persists, as reelin continues to influence synaptic plasticity and neural circuitry throughout life. Mutations in the genes associated with Cajal–Retzius cell development or reelin expression can lead to cortical malformations and neurological disorders. Studying these cells provides valuable insights into the intricate processes governing cortical development and function. While their numbers decline with age, recent research suggests that some remnants of Cajal–Retzius cells may persist in the adult brain, contributing to ongoing neuroplasticity and cognitive processes. Understanding the role of Cajal–Retzius cells is fundamental to unraveling the complexities of cortical development and its implications for neurological health.