\ɹˈɛtɪnə], \ɹˈɛtɪnə], \ɹ_ˈɛ_t_ɪ_n_ə]\
Definitions of RETINA
- 1919 - The Winston Simplified Dictionary
- 1920 - A practical medical dictionary.
- 1898 - Warner's pocket medical dictionary of today.
- 1899 - The american dictionary of the english language.
- 1919 - The Concise Standard Dictionary of the English Language
- 1914 - Nuttall's Standard dictionary of the English language
- 1874 - Etymological and pronouncing dictionary of the English language
- 1920 - A dictionary of scientific terms.
- 1846 - Medical lexicon: a dictionary of medical science
- 1898 - American pocket medical dictionary
- 1916 - Appleton's medical dictionary
- 1871 - The Cabinet Dictionary of the English Language
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By William Dodge Lewis, Edgar Arthur Singer
Optomeninx, the inner, nervous, tunic of the eyeball, consisting of an outer pigment layer attached to the inner surface of the chorioid, ciliary body, and iris, and an inner layer formed by the expansion of the optic nerve. It comprises an optic or physiological portion which receives the visual rays, and a non-percipient ciliary portion, or pars coeca retinoe, the two being separated by the ora serrata. The optic portion consists of eight layers, as follows (the numbers referring to the layers as shown in the cut): 1, pigment layer, stratum pigmenti; 2, layer of rods and cones, bacillary layer; 3, outer nuclear layer; 4, outer molecular layer; 5, inner nuclear layer;.6, inner molecular layer; 7, ganglionic layer; 8, nerve-fiber layer, stratum opticum; between the layer of rods and cones and the outer nuclear layer is the outer limiting membrane, and covering the stratum opticum is the inner limiting membrane.
By Stedman, Thomas Lathrop
By William R. Warner
By Daniel Lyons
By James Champlin Fernald
By Nuttall, P.Austin.
By Stormonth, James, Phelp, P. H.
By Henderson, I. F.; Henderson, W. D.
A soft, pulpy, grayish, semitransparent, very thin membrane; extending from the optic nerve to the crystalline, embracing the vitreous humour, and lining the choroid; without, however, adhering to either of those parts. It terminates by a defined edge- margo dentalus -at the posterior extremities of the ciliary processes. It is constituted, according to most anatomists, by the expansion of the optic nerve. The retina appears to be formed of several laminae; so joined together, that it is difficult to discriminate them. The one -the innermost-is medullary, and pulpy; the other- the other-is stronger, and fibro-vascular. The retina is the essential organ of vision; on it the images of objects are impressed. Both it and the optic nerve are devoid of general sensibility. They may be punctured or lacerated without pain being experienced. The nerve of general sensibility distributed to the eve is the fifth pair.
By Robley Dunglison
By Willam Alexander Newman Dorland
By Smith Ely Jelliffe
Word of the day
- One versed in phthisiology; a specialist the prevention and treatment of phthisis; phthisiotherapist.