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Mantle layer: This layer is composed of neuron cell bodies and becomes gray matter. Its gross anatomic color is gray because the cell bodies are not myelinated.

Marginal layer: This layer is composed of axons and becomes white matter. Its anatomic color is white because of the fatty myelin that surrounds axons.

What Is the Neural Tube?

The Nervous System

Pharyngeal arch skeletal and connective tissue components;

The Nervous System

• Pharyngeal arch skeletal and connective tissue components;
• Bones of neurocranium;
• Pia and arachnoid;
• Parafollicular (C) cells of thyroid;
• Aorticopulmonary septum;
• Odontoblasts (dentin of teeth);
• Sensory ganglia of CN V, CN VII, CN IX, and CN X;
• Ciliary (CN III), pterygopalatine (CN VII), submandibular (CN VII), and otic (CN IX) parasympathetic ganglia.

Neural Crest cells