. The anatomy of the domestic animals . Veterinary anatomy. FiQ. 690.—Piece of Upper Eyelid; Inner Surface. 1, Cilia; S, limbus palp, posterior; 3, tarsal glands. (After EUenberger, in Leisering's Atlas.) Fig. 691.—Cartilage of Third Eyelid of Horse; Convex Surface. 1, Gland; S, fat surrounding deep part of cartilage. (After EUenberger, in Leisering's Atlas.) The bulbar conjunctiva is loosely attached to the anterior part of the sclera and is pigmented in the vicinity of the corneo-scleral junction. On the cornea it is repre- sented by a stratified epithelium. When the lids are in apposition,
. The anatomy of the domestic animals . Veterinary anatomy. FiQ. 690.—Piece of Upper Eyelid; Inner Surface. 1, Cilia; S, limbus palp, posterior; 3, tarsal glands. (After EUenberger, in Leisering's Atlas.) Fig. 691.—Cartilage of Third Eyelid of Horse; Convex Surface. 1, Gland; S, fat surrounding deep part of cartilage. (After EUenberger, in Leisering's Atlas.) The bulbar conjunctiva is loosely attached to the anterior part of the sclera and is pigmented in the vicinity of the corneo-scleral junction. On the cornea it is repre- sented by a stratified epithelium. When the lids are in apposition, the conjunctiva (including the epithelium of the cornea) encloses a capillary space between the lids and the eyeball, and constitutes what is known as the conjunctival sac. The third eyelid (Palpebra tertia) is situated at the medial angle of the eye. It consists of a semilunar fold of the conjunctiva, kno^vn as the membrana nictitans, which covers and partly encloses a curved plate of hyaline cartilage. Its marginal part is thin and usually more or less pigmented. The cartilage has an elongated quadrilateral outline. The part of it which lies in the membrana is wide and thin. The deep part is narrower and thicker and is embedded in fat at the inner side of the eyeball. Numerous minute lymph nodules occur in the membrana nictitans, and the deep part of the cartilage is surrounded by a gland which resembles the lacrimal gland in structure (Glandula superficialis palpebrse tertise). Ordinarily the third eyelid extends very little over the medial end of the cornea, but wJhen the eyeball is strongly retracted, the membrana is protruded over it so as to measure about an inch (ca. 2-3 cm.) in its middle. This effect results from the pressure of the eyeball and its muscles on the fat which surrounds the deep part of the cartilage. Vessels and Nerves.—The arteries which chiefly supply the eyelids and con- 1 Also known as the Meibomian Please note that these images are ex
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