what is Cornea , Sclera , Choroid , Ciliary body

Cornea
1. Epithelium is formed from the surface ectoderm.
2. Other layers viz. endothelium, Descemet's..
membrane, stroma and Bowman's layer are derived
from the fibrous layer of mesenchyme lying anterior
to the optic cup

Sclera
Sclera is developed from the fibrous layer of
mesenchyme surrounding the optic cup (corresponding
to dura of CNS)

Choroid
It is derived from the inner vascular layer of
mesenchyme that surrounds the optic cup

Ciliary body

• 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 cup 
  
  

  

  Derivation of various structures of the eyeball.