Medical Sentinel Volume 4

Medical Sentinel Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...border of the lid, owing to the way in which the latter is lubricated with fatty matter. They accumulate in the horseshoe shaped notch in the inner angle of the eye and form the locus lachrymalis, into which the punctum dips." In addition to this the passage of the tears is facilitated through the canaliculi into the sac, by the sac being relaxed as the lid is closed by the contraction of the internal palpebral ligaments--Horner's muscle--at this particular time drawing the sac up and out, thus forming a vacuum, and the contents of the canaliculi are sucked into it. From the lachrymal sac the tears are expelled into the nasal duct by the relaxation of the internal palpebral ligament and the constriction of the lachrymal sac by its normal elasticity, assisted by gravitation. If the lower punctum be deviated from its normal position from any cause, even though the canal be normal in all respects, more or less epiphora will be produced. The epiphora due to facial paralysis is due to a loss of the compressing and sucking action of the punctum from a want of tone of the fibers of the orbicularis and a slight falling of the lid away from the eye, with a consequent displacement of the lower punctum. The canaliculi and puncta may be stopped by chronic diseases of the border of the lower lids, as granular lids, granular disease of the conjunctiva, ophthalmia tarsi, causing cicatricial stricture; also tumefaction, with narrowing of the canaliculi--in any case the punctum may be displaced as well as constricted. Again, malignant growths starting at or near the punctum and finally blocking it; also another common cause is traumatism. Sometimes the canaliculi are plugged with amycelial fungus, which, when mixed with mucus and pus cells, forms more

Product details

  • Paperback | 246 pages
  • 189 x 246 x 13mm | 445g
  • United States
  • English
  • black & white illustrations
  • 1236972384
  • 9781236972385