. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. Fie. 210. — A. HARDERIAN GLAND (H, II1) AND LACRYMAL GLAND (Th) OF Any uin fragilis. B, eyeball; M, muscle of jaw. Fio. 210.—B. DIAGRAMMATIC TRANSVERSE VERTICAL SECTION THROUGH THE EYK OF A MAMMAL. B, eyeball ; Fo, Fo, upper and lower conjunctival sac ; H, H, eyelashes ; LH, LII, outer skin of the eyelids, which at the free edges of the latter, at t, becomes continuous with the conjunctiva ; Op, optic nerve ; T, the so-called tarsal fibro-cartilages, in which the Meibomian glands (MD) lie embedded, the latter opening at *
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. Fie. 210. — A. HARDERIAN GLAND (H, II1) AND LACRYMAL GLAND (Th) OF Any uin fragilis. B, eyeball; M, muscle of jaw. Fio. 210.—B. DIAGRAMMATIC TRANSVERSE VERTICAL SECTION THROUGH THE EYK OF A MAMMAL. B, eyeball ; Fo, Fo, upper and lower conjunctival sac ; H, H, eyelashes ; LH, LII, outer skin of the eyelids, which at the free edges of the latter, at t, becomes continuous with the conjunctiva ; Op, optic nerve ; T, the so-called tarsal fibro-cartilages, in which the Meibomian glands (MD) lie embedded, the latter opening at *. FIG. 210.—C. DIAGRAM OF THE LACRYMAL APPARATUS OF MAN. D, naso-lacrymal duct ; 8, lacrymal sac ; TD, lacrymal gland, divided up into several portions: TR, TR1, upper and lower lacrymal canals; **, ducts of the lacrymal gland ; ft- puncta lacrymalia. histologically and physiologically different elements, is present from the tailless Amphibia to the Mammalia, but is rudimentary in the Primates. The Meibomian glands (Fig. 210,B) are confined to the Mammalia, and lie embedded in the substance of the eyelids in the form of branched, tree-like tubes or clustered masses. They open on the free edge of the lid, produce a fatty secretion, and originally u. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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