| 释义 |
lacrimal sac
Thesaurus| Noun | 1. | lacrimal sac - either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glandsdacryocyst, tear saclacrimal apparatus - the structures that secrete and drain tears from the eyevesicle, cyst - a small anatomically normal sac or bladderlike structure (especially one containing fluid) |
lacrimal sac
lacrimal sac[′lak·rə·məl ‚sak] (anatomy) The dilation at the upper end of the nasolacrimal duct within the medial canthus of the eye. Also known as dacryocyst. lacrimal sac
sac [sak] a baglike organ or structure; see also bag, pocket, and pouch.air s's (alveolar s's) the spaces into which the alveolar ducts open distally, and with which the alveoli communicate; see also lung" >lung.amniotic sac the sac formed by the amnion, enclosing the fetus suspended in amniotic fluid; popularly known as the bag of waters.conjunctival sac the potential space, lined by conjunctiva, between the eyelids and the eyeball.endolymphatic sac the blind, flattened cerebral end of the endolymphatic duct.hernial sac the peritoneal pouch that encloses protruding intestine.lacrimal sac the dilated upper end of the nasolacrimal duct; see also lacrimal apparatus.yolk sac the extraembryonic membrane connected with the midgut; in vertebrates below true mammals, it contains a yolk mass. Yolk sac in a developing embryo. From Applegate, 2000.lac·ri·mal sac [TA] the dilated upper portion of the nasolacrimal duct into which the two lacrimal canaliculi empty. Synonym(s): saccus lacrimalis [TA], dacryocyst, sacculus lacrimalis, tear saclac·ri·mal sac (lak'ri-măl sak) [TA] The upper portion of the nasolacrimal duct into which empty the two lacrimal canaliculi.
Synonym(s): saccus lacrimalis [TA] , dacryocyst, tear sac. lacrimal sac The small bag lying under the tissues just inwards and below the inner corner of the eye. Tears drain into the lacrimal sac before being discharged down the nasolacrimal duct into the nose.Lacrimal sacThe dilated upper end of the nasolacrimal duct in which the lacrimal ducts empty.Mentioned in: Lacrimal Duct Obstructionlacrimal apparatusThe system involved in the production and conduction of tears. It consists of the lacrimal gland and accessory lacrimal glands (glands of Krause and Wolfring); the eyelid margins; and the two puncta lacrimae. Each punctum is a small round or oval aperture situated on a slight elevation at the inner end of the upper and lower lid margin (lacrimal papilla) and forms the entrance to the canaliculi. Each canaliculus consists of a vertical portion of about
lacrimal apparatusThe system involved in the production and conduction of tears. It consists of the lacrimal gland and accessory lacrimal glands (glands of Krause and Wolfring); the eyelid margins; and the two puncta lacrimae. Each punctum is a small round or oval aperture situated on a slight elevation at the inner end of the upper and lower lid margin (lacrimal papilla) and forms the entrance to the canaliculi. Each canaliculus consists of a vertical portion of about 2 mm long and then bends inward for some 8 mm, the upper one being slightly shorter. The canaliculi pierce the lacrimal fascia (i.e. the periorbita covering the lacrimal sac or tear sac) and unite (forming the common canaliculus) to enter a small diverticulum of the sac called the sinus of Maier. The lacrimal sac is closed above and open below where it is continuous with the nasolacrimal duct which extends over some 1.5 cm in length to Hasner's valve (or Bianchi's valve or plica lacrimalis) (folds of mucous membrane) at the inferior meatus of the nose. The inferior opening of the duct is called the ostium lacrimale (Fig. L1). See dacryocystitis; epiphora; lacrimal fistula; fossa for the lacrimal sac; Sjögren's syndrome; tear duct; dye dilution test; Jones II test; valve of Krause. " > Fig. L1 Lacrimal apparatuslacrimal sac
Related to lacrimal sac: lacrimal apparatus, nasolacrimal duct, lacrimal caruncleSynonyms for lacrimal sacnoun either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glandsSynonymsRelated Words- lacrimal apparatus
- vesicle
- cyst
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