| lacrimal bay | The small cistern-like area of the conjunctiva at the medial angle of the eye, in which the tears collect after bathing the anterior surface of the eyeball and the conjunctival sac. Synonym: lacus lacrimalis, lacrimal bay. (05 Mar 2000) |
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| lacrimal bone | An irregularly rectangular thin plate, forming part of the medial wall of the orbit behind the frontal process of the maxilla; it articulates with the inferior nasal concha, ethmoid, frontal, and maxillary bones. Synonym: os lacrimale, os unguis. (05 Mar 2000) |
| lacrimal calculus | A concretion in the lacrimal apparatus. Synonym: lacrimal calculus, ophthalmolith, tear stone. Origin: dacryo-+ G. Lithos, stone (05 Mar 2000) |
| lacrimal canaliculus | A curved canal beginning at the lacrimal punctum in the margin of each eyelid near the medial commissure and running transversely medially to empty with its fellow into the lacrimal sac. Synonym: canaliculus lacrimalis. (05 Mar 2000) |
| lacrimal caruncle | A small reddish body at the medial angle of the eye, containing modified sebaceous and sweat glands. Synonym: caruncula lacrimalis. (05 Mar 2000) |
| lacrimal conjunctivitis | An obsolete term for a secondary conjunctivitis due to canaliculitis or dacryocystitis. Synonym: reflux conjunctivitis. (05 Mar 2000) |
| lacrimal duct obstruction | Interference with the secretion of tears by the lacrimal glands. Obstruction of the lacrimal sac or nasolacrimal duct causing acute or chronic inflammation of the lacrimal sac (dacryocystitis). It is caused also in infants by failure of the nasolacrimal duct to open into the inferior meatus and occurs about the third week of life. In adults occlusion may occur spontaneously or after injury or nasal disease. (12 Dec 1998) |
| lacrimal fascia | That part of the periorbita that bridges across the fossa or lacrimal sac. (05 Mar 2000) |
| lacrimal fistula | An abnormal opening into a tear duct or the lacrimal sac. (05 Mar 2000) |
| lacrimal fold | A fold of mucous membrane guarding the lower opening of the nasolacrimal duct. Synonym: plica lacrimalis, Bianchi's valve, Hasner's fold, Hasner's valve, Huschke's valve, Rosenmuller's valve. (05 Mar 2000) |
| lacrimal fossa | A hollow in the orbital plate of the frontal bone, formed by the overhanging margin and zygomatic process, lodging the lacrimal gland. Synonym: fossa glandulae lacrimalis, fossa of lacrimal gland. (05 Mar 2000) |
| lacrimal gland | The gland that secretes tears; it consists of 6 to 12 separate compound tubuloalveolar serous glands, located in the upper lateral part of the orbit, and is partially divided into a smaller palpebral part and a larger orbital part by the aponeurosis of the levator palpebrae muscle. Synonym: glandula lacrimalis. (05 Mar 2000) |
| lacrimal gland enlargement | <radiology> Epithelial tumours (50%), benign adenoma (25%), carcinoma (25%); adenocystic carcinoma most common, lymphoid lesions (50%), lymphoma, benign lymphoid hyperplasia, pseudotumour, Sjogren syndrome, Mikulicz's, dermoid, metastasis (12 Dec 1998) |
| lacrimal groove | The groove in the nasal surface of the maxilla which, together with the lacrimal bone, forms the fossa for the lacrimal sac. Synonym: sulcus lacrimalis. (05 Mar 2000) |
| lacrimal hamulus | The hooklike lower end of the lacrimal crest, curving between the frontal process and orbital surface of the maxilla to form the upper aperture of the bony portion of the nasolacrimal canal. Synonym: hamulus lacrimalis, hamular process of lacrimal bone. (05 Mar 2000) |