The lamina cribrosa is a sieve-like plate of connective tissue at the back of the eye through which the optic nerve fibres and the central retinal vessels pass out of the eye.
| Location | Posterior sclera at the optic nerve head |
|---|---|
| Parts |
|
| Nerve Supply | Short ciliary nerves |
| Blood Supply | Short posterior ciliary arteries (circle of Zinn-Haller) |
Supports the optic nerve fibres as they leave the high-pressure inside of the eye.
In glaucoma the lamina bows backwards under pressure, squeezing the nerve fibres and contributing to cupping of the optic disc. Its pores can be seen at the base of a deep cup during eye examination.
Backward bowing of the lamina and loss of nerve fibres seen as an enlarged optic cup.
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