Neuro exam localizer

Neural Crest

When the stem names peripheral ganglia, Schwann cells, melanocytes, adrenal medulla, or thyroid C cells, stop thinking neural tube. Those are the migrators.

Before you scroll: A newborn has absent dorsal root ganglia and impaired development of autonomic ganglia. The same embryologic population normally also gives rise to Schwann cells and adrenal medulla chromaffin cells. Which embryologic structure is defective?

The nervous system starts from ectoderm, but it splits into two jobs. The neural tube stays home and becomes brain, spinal cord, retina, and central glia. The neural crest migrates away and builds the peripheral nervous system plus adrenal medulla, melanocytes, craniofacial pieces, and thyroid C cells. Peripheral ganglia + Schwann + adrenal medulla = neural crest.

Embryology split

Homebody Tube vs Traveling Crest

Tap the lineages. The board move is not memorizing every derivative. It is asking whether the cell stayed central or migrated out.

Neural crest

The migrators

Core cluePNS ganglia, Schwann cells, adrenal medulla, melanocytes

Nervous systemDorsal root, autonomic, enteric, and many cranial sensory ganglia

Endocrine trapAdrenal medulla chromaffin cells and thyroid C cells

Disease hooksHirschsprung, NF1 tumors, pheochromocytoma, medullary thyroid carcinoma

Neural tube

The central tube

Core clueBrain and spinal cord parenchyma

GliaOligodendrocytes, astrocytes, ependymal cells

Eye trapRetina and optic nerve are central outgrowths

Disease hooksNeural tube closure defects, ependymoma, central gliomas

Surface ectoderm

Skin and sensory epithelium

Core clueEpidermis, lens, inner ear epithelium

Pituitary trapAnterior pituitary comes from Rathke pouch

Not hereNo dorsal root ganglia, no Schwann cells

RuleSurface makes coverings and epithelial sensory pieces

Mesoderm and endoderm traps

Same organ, different parent

Adrenal trapCortex is mesoderm, medulla is crest

Thyroid trapFollicular cells are endoderm, C cells are crest

KidneyRenal tubules are intermediate mesoderm

Gut liningGI epithelium is endoderm, enteric ganglia are crest

Board trap: Ectoderm is not specific enough. Neural tube and neural crest both come from neuroectoderm, but they build different worlds.

Lineage switchboard

Name the Parent Cell

Pick the derivative. The readout forces the embryologic split before the answer feels automatic.

Which embryologic population built this structure?

Pick a clue.The fastest route is: central nervous system structure means tube; peripheral nerve support, ganglia, chromaffin, melanocyte, or C cell means crest.

Board trap: Do not let the word adrenal pull you to mesoderm automatically. Adrenal cortex is mesoderm. Adrenal medulla is crest.

Two-gate discriminator

Decision Tree

Answer the two embryology gates before naming the derivative.

Is the structure a brain, spinal cord, retina, or central glial cell?

Yes. It stayed central.

No. It is peripheral, endocrine, skin pigment, or craniofacial.

Is it a peripheral ganglion, Schwann cell, adrenal medulla, melanocyte, or thyroid C cell?

Yes. It migrated out from the dorsal neural folds.

No. It is likely surface ectoderm, endoderm, or mesoderm.

Make it stick

Hooks and Images

The memory problem is the migration problem: tube stays, crest travels.

TUBE

Tube stays home

Neural tube is the central apartment building: brain, cord, retina, central glia. If it sounds like CNS parenchyma, keep it in the tube.

tap to reveal

CREST

Crest gets on the road

Crest migrates. Anything that had to travel to a peripheral nerve, adrenal medulla, skin pigment cell, or thyroid C cell should light up crest.

tap to reveal

SPLIT

Same organ trap

Adrenal cortex and medulla are not siblings. Thyroid follicular cells and C cells are not siblings. Same organ can hide two parents.

tap to reveal

Neural crest formation · tap to expand

Migration paths · tap to expand

Neural tube · tap to expand

Board walkthrough

Prove It

One vignette at a time. Choices shuffle. The bank does not repeat until it is exhausted.

Vignette 1Never-repeat tracking ready

Exam tools: right-click or long-press to cross out a choice. Double-click or double-tap to highlight one. Tools switch off after you answer.

Neural Crest

Homebody Tube vs Traveling Crest

Neural crest

Neural tube

Surface ectoderm

Mesoderm and endoderm traps

Name the Parent Cell

Decision Tree

Hooks and Images

Prove It

KEEP GOING