lamina cribrosa [`lam·ǝ·nǝ krǝ`brō·sǝ] ANATOMY 1. The portion of the sclera which is perforated for the passage of the optic nerve. 2. The fascia covering the saphenous opening in the thigh. 3. The anterior or posterior perforated space of the brain. 4. The perforated plates of bone through which pass branches of the cochlear part of the vestibulocochlear nerve. |