Outermost protective layer of the eye.
Retina
Choroid
Sclera
Conjunctiva
The sclera is the white outermost part of the eye. The conjunctiva just covers the exposed part of the eye.
Outermost protective layer around the foetus
Plasma membrane is the outermost protective layer in cells of all plants and animals.
The outermost protective covering of the brain is called as: