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Tiny clear spaces form in the lamina cribrosa and in front and behind it in the nerve tissue. Their exact nature is unknown. Usually they are entirely empty, often they are traversed by fine glial fibers. They seem to be in no relation to the blood vessels. Adjoining lacunae are supposed to fuse to form larger cavernae and these finally merge and constitute the final glaucoma cup.
He rapped with his knuckles, but a hollow sonority revealing the void, "intonuere cavernae," echoed beyond the door which he vainly appealed to with his fist. He also perceived from beneath that door a ray of vivid light, the sure sign of an uninhabited apartment where curtains and carpets and furniture no longer dim the light or deaden sound.
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