Developmental Neuroscience Cheat Sheet
The core ideas of Developmental Neuroscience distilled into a single, scannable reference — perfect for review or quick lookup.
Quick Reference
Neurogenesis
The process by which new neurons are generated from neural stem cells and progenitor cells. During embryonic development, neurogenesis occurs at an extraordinary rate, producing most of the brain's neurons by birth. Limited neurogenesis continues in specific adult brain regions such as the hippocampus and subventricular zone.
Synaptic Pruning
The process by which excess synapses are selectively eliminated during development and adolescence. Pruning is largely activity-dependent: frequently used synapses are strengthened and retained, while rarely used ones are removed, following a 'use it or lose it' principle.
Critical Periods
Restricted developmental time windows during which the nervous system is especially sensitive to specific environmental stimuli. During these periods, certain experiences are required for normal neural circuit formation, and their absence can cause permanent deficits.
Neural Migration
The process by which newly born neurons travel from their birthplace in proliferative zones to their final destinations in the brain. Migration relies on chemical signals and physical scaffolding provided by radial glial cells.
Myelination
The process by which oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system wrap axons in a fatty myelin sheath. Myelination dramatically increases the speed and efficiency of neural signal transmission.
Neural Induction
The process during early embryonic development by which ectodermal tissue is signaled to differentiate into neural tissue rather than epidermal tissue. Key signaling molecules such as noggin, chordin, and follistatin from the organizer region inhibit BMP signaling to specify neural fate.
Axon Guidance
The process by which growing axons navigate through the developing brain to reach their correct synaptic targets. Growth cones at the tips of axons respond to attractive and repulsive molecular cues, including netrins, semaphorins, ephrins, and Slits.
Neuroplasticity
The brain's ability to reorganize its structure and function in response to experience, learning, or injury. While plasticity is highest during development, it persists throughout life at reduced levels and underlies all learning and memory.
Apoptosis (Programmed Cell Death)
A genetically controlled process in which excess neurons are systematically eliminated during development. Roughly 50 percent of all neurons produced during embryogenesis undergo apoptosis, primarily those that fail to establish functional synaptic connections or receive sufficient neurotrophic factor support.
Epigenetics in Neural Development
The study of how heritable changes in gene expression occur without alterations to the DNA sequence itself. Epigenetic mechanisms such as DNA methylation, histone modification, and non-coding RNA regulation play critical roles in neural differentiation, synaptic plasticity, and the long-term effects of early experience on brain function.
Key Terms at a Glance
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