from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Glassy or transparent in appearance; hyaline.
from The Century Dictionary.
- Hyaline; transparent; glassy.
- noun The hyaloid membrane.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Anat.) Resembling glass; vitriform; transparent; hyaline.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina
- adjective resembling glass in transparency or translucency
from The American Heritage® Dictionary of the English Language, 4th Edition
In the center of the vitreous body, running from the entrance of the optic nerve to the posterior surface of the lens, is a canal, the hyaloid canal, filled with lymph and lined by a prolongation of the hyaloid membrane.
The zonula ciliaris splits into two layers, one of which is thin and lines the hyaloid fossa; the other is named the suspensory ligament of the lens: it is thicker, and passes over the ciliary body to be attached to the capsule of the lens a short distance in front of its equator.
The artery immediately bifurcates into an upper and a lower branch, and each of these again divides into a medial or nasal and a lateral or temporal branch, which at first run between the hyaloid membrane and the nervous layer; but they soon enter the latter, and pass forward, dividing dichotomously.
It rests, behind, in the hyaloid fossa in the forepart of the vitreous body; in front, it is in contact with the free border of the iris, but recedes from it at the circumference, thus forming the posterior chamber of the eye; it is retained in its position chiefly by the suspensory ligament of the lens, already described.
It is transparent, of the consistence of thin jelly, and is composed of an albuminous fluid enclosed in a delicate transparent membrane, the hyaloid membrane.
By the second month the lens is invested by a vascular mesodermal capsule, the capsula vasculosa lentis; the bloodvessels supplying the posterior part of this capsule are derived from the hyaloid artery; those for the anterior part from the anterior ciliary arteries; the portion of the capsule which covers the front of the lens is named the pupillary membrane.
Its outer surface is in contact with the choroid; its inner with the hyaloid membrane of the vitreous body.
By the sixth month all the vessels of the capsule are atrophied except the hyaloid artery, which disappears during the ninth month; the position of this artery is indicated in the adult by the hyaloid canal, which reaches from the optic disk to the posterior surface of the lens.
It fills the concavity of the retina, and is hollowed in front, forming a deep concavity, the hyaloid fossa, for the reception of the lens.
They are like two balls of fire, and there is a peculiar transparency of the hyaloid membrane, or injection of that of the retina.