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Cranial
face + cranial ganglia
Vagal
enteric nervous system (MAJOR contributor)
Trunk
DRG, sympathetic ganglia, adrenal medulla, melanocytes
Sacral
enteric nervous system (MINOR, distal gut)
Two migration patterns
cranial migration and trunk migration.
Dorsal root ganglia (DRG Neurons)
Cell bodies are outside spinal cord
One process splits into:
Afferent → to body (sensory)
Efferent → into spinal cord
👉 keyword: bifurcates
. Sensory Neuron Types

Small + thin/unmyelinated → SLOW
Nociceptors, Thermoreceptors
large + myelinated → FAST
Mechanoreceptors, Proprioceptors
Specific Mechanoreceptors
Meissner’s → light touch
Pacinian → deep pressure + vibration
Ruffini → stretch
Nociceptor subtypes
peptidergic (respond to NGF)
non-peptidergic (respond to GDNF)
Two waves of DRG neurogenesis
1. First wave: large-diameter neurons (proprioceptors, mechanoreceptors)
2. Second wave: small-diameter neurons (thermoreceptors, nociceptors)