Image from page 346 of "The American encyclopedia and dictionary of ophthalmology Edited by Casey A. Wood, assisted by a large staff of collaborators" (1913)
Publisher: Chicago : Cleveland Press
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mal size. Gonin regards it as probable that these anastomotic vessels haveresulted from the development of fine communications, which usually 342 ANATOM exist in and about the head of the optic nerve before the centralartery has been obstructed. This seems to him more iDrobable thanthe supposition that these vessels were anomalous and peculiar tothis particular case; or that they existed fully developed and readyto take up the circulation as soon as the obstruction of the maintrunk occurred; for in spite of the anastomotic vessels the eyebecame and remained entirely blind. Anatom. (G.) Anatomist. Anatomiren. (G.) To dissect. Anatomisch. (G.) Anatomical, anatomically. Anatomy, Microscopical, of the eye. See Histology of the eye. Anatomy of the eye, Comparative. See Comparative ophthalmology. Anatomy (gross) of the human eye and of its appendages. In thefollowing pages both the histology, or microscopical anatomy, of theocular apparatus and of its physiology will be incompletely consid-
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Eyelids Naturally Open, Horizontal Plane Passes Through the Inner Canthus. ered; a few details of the latter will be given. As is well knownthere is no strict line of demarcation between the two subjects;and the same may, in another sense, be said of the macroscopicalanatomy and the physiology (q. v.) of the same organs, though noattempt is made in this section to cover the latter subject whichwill, with the histology (q. v.) be elsewhere described. The eyelids [palpehra superior; palpehra inferior] which coverand protect the eyeball, are formed from upper and lower folds ofembryonic skin. Their margins bec6me joined at the third monthof fetal life by union of the conjunctival epithelium. Shortly beforebirth rupture of this union occurs and the lids become separatedfrom each other. In many animals this separation does not takeplace until several days after birth. ANATOMY (GROSS) OF THE HUMAN EYE 343 The skin of the eyelids is of the thinnest found covering the humanbody; it becomes qu
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