| Term | Definition |
|---|
| Ganglion | Group of nerve cell bodies outside the CNS |
| Neuroepithelium | Gives rise to neurons with cell bodies in the CNS and with axons in the PNS |
| Neural crest | Gives rise to neurons with cell bodies and axons in the PNS only |
| Ectodermal placodes | Special thickened regions of ectoderm that give rise to neurons in several sensory ganglia associated with cranial nerves |
| Neural tube | Precursor to CNS |
| Neuroectoderm | Neural is composed of this embryonic tissue |
| Cytodifferentiation | Cells in neural tube wall divide and migrate to form different regions that mature into columns of neurons |
| Mantle layer | Presumptive gray matter |
| Marginal layer | Presumptive white matter |
| Neural crest | Forms neurons in dorsal root ganglia and chain ganglia |
| Dorsal root ganglia | Sensory somatic |
| Chain ganglia | sympathetic autonomic |
| Motor neurons | Arise as the first neurons in the brain and spinal cord, emerge in a craniocaudal wave |
| Spinal nerve | Ventral root and dorsal root axons join to form |
| Growth cone | Leading edge of growing axon |
| Pathfinding | Growth cone senses molecular markers on surfaces of cells or in the extracellular matrix |
| Pioneer growth cones | Establish pathways that are used later by other axons which follow the same route |
| Spinal nerve | Extend out into limb buds |
| Neural crest | Neuronal cell bodies in chain ganglia form from |
| Chain ganglia | Gray and white rami connect spinal nerves to |
| Myotome | Epimeres and hypomeres arise from the split of |
| White ramus | Contains preganglia sympathetic motor neuron fibers |
| Gray ramus | Contains postganglia sympathetic motor neuron fibers |
| Somites | Sensory and somatic motor axons innervate specific targets in body wall and extremities by following the segmental pattern established by |
| Prevertebral ganglia | Some preganglia sympathetic fibers do not join spinal nerves, instead they go through chain ganglia and travel as splanchnic nerves to the |
| Vagus | Follows stomach as it rotates from left to right during development |
| Hirschsprung disease | Lack of parasympathetic enteric ganglia and defects in neural crest migration |
Combine with other sets
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