. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. THE EYE AND ITS APPENDAGES. 175 terior surface of the lids, discharging by numerous orifices along the edges of the lids a viscid fluid which prevents the overflow of tears at night. Caruncula lachrymalis.'^—A small, red elevation, in the internal canthus, about the size of a grain of wheat; consisting of an aggre- gation of small glands, and often furnished with hairs. Lachrymal gland?—A lobulated gland, about the s
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. THE EYE AND ITS APPENDAGES. 175 terior surface of the lids, discharging by numerous orifices along the edges of the lids a viscid fluid which prevents the overflow of tears at night. Caruncula lachrymalis.'^—A small, red elevation, in the internal canthus, about the size of a grain of wheat; consisting of an aggre- gation of small glands, and often furnished with hairs. Lachrymal gland?—A lobulated gland, about the size of a filbert, and of a light pink colour, situated in a fossa on the roof of the orbit, near the external angular process. It consists of two portions, viz., orbital and palpebral. It discharges tears by ten or twelve ducts,* whose orifices open upon the upper and outer part of the conjunctiva. Lachrymal canals.—These open by two small orifices upon a papilla at the inner part of each lid, called puncta lachrymalia,^ The tears enter these orifices and are conveyed along a bent Fig. 152. canal into the lachrymal sac. Tensor tarsi or Horner'^s muscle.—(Fig. 152.)—Arises from the os unguis,* and is in- serted by two divisions* into the orifices of the lachrymal canal. Its nasal face adheres to the lachrymal sac. Lachrymal sac and nasal duct.—Is a continuous tube contained in the passage formed by the nasal process of the superior maxillary, the unguiform, and inferior turbinated bones. Its external coat is fibrous, and its internal mucous ; it is larger above than it is below, and opens into the inferior meatus of the nose. The mucous lining forms a semicircular fold or valve. The muscles: Levator palpehrce si^perioris.*—Origin, near the optic foramen. Insertion, by a broad aponeurosis into the upper lid. It draws the lid upwards. The four straight 'muscles, arise around the optic foramen ; and are inserted, by tendinous ex- pansions, within a few lines '^* of th
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