<prompt> Which is a derivative of neural crest -EnamelSpinal cordNailsDentine  <response>: Ans. is d i.e., DentineDerivatives of surface ectodermi Skin and appendages : Epidermis, hair, nails, sweat glands, sebaceous glands.ii Mucous membrane of: Oral cavity, nasal cavity, paranasal sinuses, lower part of anal canal, terminal part of urethra, outer surface of labia minora, whole labia majora, lower part of vagina.iii Eye : Crystalline lens, epithelium of cornea and conjunctiva, lacrimal gland.iv Ear: Outer layer of tympanic membrane, epithelial lining of membranous labyrinth.v Glands : Exocrine glands sweat glands, sebaceous glands, salivary glands, mammary glands, lacrimal glands, endocrine gland anterior part of pituitary.vi Teeth : Enamel Ameloblast.vii Pharyngeal CleftsDerivatives of neuroectodermi From neural tube : CNS brain, spinal cord, astrocytes, oligodendrocytes, ependymal cells, retina, pineal gland, neurohypophysis posterior pituitary, all cranial and spinal motor nerves.ii From neural crest: Neural crest derivatives are:-a Neural derivatives Sensory neurons of 5th, 7th, 8th, 9th, 10th cranial nerve ganglia trigeminal, geniculate, sphenopalatine, submandibular, cochlear, vestibular, otic and vagal parasympathetic ganglia. Sensory neurons of spinal dorsal root ganglia. Sympathetic chain ganglia and plexus celiacpreaorticrenal ganglia, enteric plexus in GIT, i.e. Auerbachs and Meissners Parasympathetic ganglia and plexus of GIT. Schwann cells of peripheral nerves, satellite cells of all ganglia. Adrenal medulla, chromaffin cells, para follicular C-cells of thyroid gland. Melanocytes and melanoblasts. a Glomus cellsb Mesenchymal derivatives Dermal bones of skull: Frontal, parietal, temporal, nasal, vomer, palatine, mandible, maxillae. Leptomeninges : arachnoid and pia mater Durameter is mesodermal, a Dentine of teeth odontoblasts. Eye: choroid, sclera, iris epithelium, pupillary muscles sphincter and dilator pupillae, ciliary muscles. Pharyngeal arch cartilages. Retinal pigmented epithelium. Connective tissues of head including dermis, tendon, ligaments. Bulbar and conal ridges of heart. 