File:The American encyclopedia and dictionary of ophthalmology Edited by Casey A. Wood, assisted by a large staff of collaborators (1913) (14596258808).jpg

Identifier: encyclopediaopth01wood (find matches)
Title: The American encyclopedia and dictionary of ophthalmology Edited by Casey A. Wood, assisted by a large staff of collaborators
Year: 1913 (1910s)
Authors: Wood, Casey A. (Casey Albert), 1856-1942
Subjects: Ophthalmology
Publisher: Chicago : Cleveland Press
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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Two margins of the tarsalcartilage are designated, viz.: an upper, or convex, margin, and alower, or free, margin; there are also two surfaces, an anterior anda posterior. These plates are highest at the center and taper off to-ward the ends. The tarsus gives form to the upper lid; and, whenboth lids are closed, forms a shield for the eyeball. They are attachedto the frontal process of the superior maxilla by the tendo oculi, orligamentum palpebrte mediale, and are united to the margins of theorbit by the tarso-orbital fascia. The levator palpebrte superioris isattached to this fascia and to the upper edge of the tarsal plate. ANATOMY (GROSS) OF THE HUMAN EYE 349 Opening on the conjunctival surface are the glands of Waldeyer,acino-tubular structures, secreting a modified mucus. A constantmucous secretion from the various conjunctival and other glands,moistens and lubricates the anterior ocular structures. The cornea,particularly, is kept clean and bright from this source, aided by the
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Lymphatics of the Head and Eye.approximation of the lid-edges in winking. This closing of the lidsacts like a window-scraper; it gently removes all deleterious mat-ter from the front of the eyeball, and pushes it toward the lachrymalpuncta, through which it is drawn, by the action of that curious suc-tion apparatus formed by Horners muscle, into the lachrymal sac,and thence into the nose. The detritus entering the puncta is partlypressed and partly floated along the canaliculi until it reaches thelachrymal sac. 350 ANATOMY (GROSS) OF THE HUMAN EYE The lachrymal apparatus may be divided iuto a secretory and anexcretory portion. The former includes not only the lachrymalglands, but the mucous glands of the conjunctiva. As a matter offact, the moisture that commonly cleanses the ocular and conjuncti-val surfaces is contributed by the mucous follicles of the conjunctiva,while more copious supplies of tears are furnished by the lachrymalgland. The latter is of the salivary variety, of a re

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