Conjunctiva

CONJUNCTIVA


 CONJUNCTIVA

  • Conjunctiva is a thin mucous membrane that covers the posterior surface of eyelids & anterior surface of eyeball.

The conjunctiva is divided into:

  1. Palpebral conjunctiva:
  • Begins from the anterior margin of the edge of lids & covers the posterior surface of eyelid.

Palbebral conjunctiva is divided into:

  1. Marginal conjunctiva
  2. Tarsal conjunctiva
  3. Orbital conjunctiva

    2. Conjunctiva fornix: this is a continuous circular cul-de-sac uniting the palpebral & bulbar conjunctiva.

    3. Bulbar conjunctiva:

  • Covers anterior part of eyeball over visible part of sclera & limbus.
  • Part of bulbar conjunctiva around cornea (over limbus) is called limbal conjunctiva.

 

  • Epithelial lining of conjunctiva is stratified non- keratinized epithelium which varies from region to region.

Important cells of conjunctiva are:

  1. Goblet cells: most dense nasally
  2. Melanocytes: found in conjunctiva at limbus, fornix, caruncle & at the site of entry of anterior ciliary vessels.
  3. Langerhans cells: in all parts of conjunctiva.

Normal bacterial flora of conjunctiva includes:

  1. Resident flora: Coagulase negative staphylococci (most common), micrococci, hemophilus, corynebacteriumm.
  2. Transient flora: Bacillus, S.viridans, pseudomonas

Exam Important

  • Epithelial lining of conjunctiva is stratified non- keratinized epithelium
  • Fusion of palpebral and bulbar conjunctiva is Symblepharon.
  • Maximum number of goblet cells are present in Nasal conjunctiva.
  • Normal conjunctival flora is Coagulase negative staphylococci.
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