All are masodermal in origin EXCEPT
Correct Answer: Ciliary body
Description: i.e. (Ciliary body): (320-IBSth Embryology 8th)CILIARY BODY - (8 - Khurana 4th)* The two layers of epithelium of ciliary body develop from the anterior part of the two layers of optic cup (Neuroectodermal)* Stroma of ciliary body, ciliary muscle and blood vessels are developed from the vascular layer of mesenchyme surrounding the optic cupThe cells of the adrenal cortex arise from coelomic epithelium (Mesoderm). The cells of adrenal medulla are derived from the neural crest (ectoderm) (300 - IBS- Embryology 8th)DERIVATIVES OF MESODERM1. All connective tissues including loose areolar tissue filling the interstics between other tissues, superficial and deep fascia, ligaments, tendons, aponeuroses and dermis of the skin2. Specialized connective tissues like adipose tissue reticular tissue, cartilage and bone3. Dentine of teeth4. All muscles (smooth, striated and cardiac Except the musculature of the iris (ectoderm) and ciliary muscle (neural crest?)5. Heart, all blood vessels and lymphatics, and blood cells6. Kidney, ureters, trigone of bladder, posterior wall of part of the female urethra, posterior wall of upper half of prostatic part of male urethra and the inner glandular zone of the prostate7. Ovary, uterus, uterine tubes, upper part of vagina8. Testis, epidydimis, ductus deferens, seminal vesicle, ejaculatory duct9. Lining mesothelium of pleural, pericardial and peritoneal cavities and of tunica vaginalis10. Lining mesothelium of bursae and joints11. Substance of cornea; sclera; choroid12. Substance of ciliary body and iris13. Duramater; pia - arachnoid (?) microglia14. Adrenal cortexSTRUCTURES DERIVED FROM THE EMBRYONIC LAYERSSurface EctodermNeural EctodermAssociated paraxial mesenchyme / Mesoderm* The crystalline lens* Epithelium of the cornea* Epithelium of the conjuctiva* Lacrimal gland* Epithelium of eyelids and its derivatives viz cilia, targal glands and conjunctival glands* Epithelium lining the lacrimal apparatus* Retina with its pigment epithelium* Epithelial layers of the ciliary body* Epithelial layers of iris* Sphincter and dilator pupillae muscles* Optic nerve (neuroglia and nervous elements only)* Melanocytes* Secondary vitreous* Ciliary zonules (tertiary vitreous)* Blood vessels of choroid, iris, ciliary vessels, central retinal artery, other vessels* Primary Vitreous* Substantia propria, Descemet's membrane and endothelium of cornea* Sclera* Stroma of iris* Ciliary muscle* Sheaths of optic nerve* Extraocular muscles* Upper and medial walls of the orbit* Connective tissue of upper eyelid
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