Illustrations of some of the principal diseases of the eye : with a brief account of their symptoms, pathology, and treatment / by Henry Power.

Henry Power

Date:: 1867

Credit: Illustrations of some of the principal diseases of the eye : with a brief account of their symptoms, pathology, and treatment / by Henry Power. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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$CHAPTER HI. HBmrnzs of t\\z 3Lac]&rgmaI ©rgans. GENERAL ANATOMY OF THE LACHRYMAL GLAND—CANALICULI— LACHRYMAL SAC AND NASAL DUCT—INFLAMMATION OF THE LACHRYMAL GLAND — LACHRYMAL FISTULA — OBSTRUCTED DUCTS AND LACHRYMAL ABSCESS. The lachrymal apparatus consists of the lachrymal gland and its ducts, by which the tears are secreted and conveyed to the surface of the conjunctiva; and the canalicuK, lachrymal sac, and nasal duct, by which they are discharged into the inferior meatus of the nose. The lachrymal gland is situated at the upper and external part of the orbit, occupying a small fossa in the orbital plate of the frontal bone. It belongs to the class of acinous glands, is of a yellow or pinkish colour, with a finely lobulated sur- face, and resembles a small portion of one of the salivary glands. Its weight is from nine to twelve grains. It dis- charges its secretion by four or five excretory ducts, the diameter of each of which does not exceed one-fiftieth of an inch, into the palpebral sinus of the upper lid. Separated from this principal gland by a process of fibrous tissue, given off from the tendon of the levator palpebral, are a few isolated lobules, which lie just external to the conjunctiva, and the ducts of which partly open into the above-mentioned proper$