<prompt> Crystalline lens develops fromMesodermEndodermSurface ectodermNeuroectoderm  <response>: The lens or crystalline lens or aquula has a key role in focussing light with the cornea upon the neural retina. The lens embryonic origin is from surface ectoderm of the sensory placodes that form in the head region . The lens focusses by refracting light as it passes through the biconvex lens, which can be altered in shape accommodation by surrounding ciliary muscles. These ciliary muscles are activated contracted by parasympathetic innervation from the ciliary ganglion itself innervated by the oculomotor nerve . Ref - 