Nerve fibre in the eye

Colour-enhanced transmission electron micrograph showing a transverse section through a nerve fibre in the corneal stroma. The Schwann cell that wraps around the nerve cells contains a nucleus, mitochondria and some rough endoplasmic reticulum. The nerve is passing through the layers of stromal lamellae - layers of collagen fibrils lying across each other at different angles thus appearing as dots or lines depending on the plane of section. The field is approximately 11 microns across.