Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely.

  • Ely, Edward T. (Edward Talbot), 1850-1885
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    Eyelids or Palpebr/E [Lat. equiv.]: Two movable, protecting folds placed before eyes closing entrance to orbit. Upper lid about t in., lower about £ in. high, measured on inner surface. Space between free margins called palpebral fissure. Outer angle of fissure called externalcanthus ; inner angle, internal canthns [Gr. xavBoS, angle of eye]. Small space between lids and globe at inner angle- called lacus laerymalis [Lat. tor lachrymal lake]. On edge of each lid about i in. from inner canthus is small elevation, lachrymal papilla, containing minute orifice, punctam [Lat. for small hole], the beginning of a lach- rymal canal or canaliculus. Lids composed of skin externally, mucous membrane inter- nally, and, between these, areolar tissue, mus- cle, cartilage, ligaments, glands, vessels, and nerves. Skin is continuous at edge of lid with conjunctiva. Is thin, lax, and contains a few fine hairs. Subcutaneous areolar tis- sue very loose, and contains sweat glands and hair follicles. Tarsal cartilages, formed of dense fibrous tissue, not true cartilage; lower one elliptical, upper crescentic and larger; orbital margins are thinned and pass into fascise {palpebral or tarsal ligaments) which connect cartilages to edge of orbit; free or ciliary margins thick and straight. Ligament thickened to connect outer an- gles of cartilages to malar bone and called external palpebral or canthal ligament.