Tag: Conjunctiva

Conjunctiva

CONJUNCTIVA

Q. 1

Maximum number of goblet cells are present in:

 A

Inferior conjunctiva

 B

Nasal conjunctiva

 C

Superior conjunctiva

 D

Temporal conjunctiva

Q. 1

Maximum number of goblet cells are present in:

 A

Inferior conjunctiva

 B

Nasal conjunctiva

 C

Superior conjunctiva

 D

Temporal conjunctiva

Ans. B

Explanation:

The density of golblet cells is maximum nasally and minimum in the upper temporal fornix. The mucus produced by them is an important component of the tear film, deficiency of which may cause dryness of the eyes.

Ref: A.K Khurana (2005), Chapter 4, “Disease of The Conjunctiva”, In the book, “Opthalmology”, 3rd Edition, Newdelhi, Page 80


Q. 2

Conjunctiva epithelium is:

 A

Pseudostratified

 B

Stratified columnar

 C

Stratified non keratinized squamous

 D

Transitional

Q. 2

Conjunctiva epithelium is:

 A

Pseudostratified

 B

Stratified columnar

 C

Stratified non keratinized squamous

 D

Transitional

Ans. C

Explanation:

C i.e. Stratified non keratinized epithelium

  • Conjunctival epithelium is stratified non keratinized squamous epitheliumQ.

Conjunctiva has palpebral (marginal, tarsal, orbital), bulbar & fornix parts. Marginal palpebral conjunctiva has transitional zone (not epithelium) covered with stratified epithelium with characteristics of both skin & conjunctiva.


Q. 3

Fusion of palpebral and bulbar conjunctiva is:

 A

Symblepharon

 B

Trichiasis

 C

Ectropion

 D

Tylosis

Q. 3

Fusion of palpebral and bulbar conjunctiva is:

 A

Symblepharon

 B

Trichiasis

 C

Ectropion

 D

Tylosis

Ans. A

Explanation:

Ans. Symblepharon

Quiz In Between


Q. 4

Epithelial lining of conjunctiva is:

March 2009

 A

Squamous keratinized

 B

Pseudo-stratified

 C

Cuboidal

 D

Stratified squamous non-keratinized

Q. 4

Epithelial lining of conjunctiva is:

March 2009

 A

Squamous keratinized

 B

Pseudo-stratified

 C

Cuboidal

 D

Stratified squamous non-keratinized

Ans. D

Explanation:

Ans. D: Stratified squamous non-keratinized

The conjunctiva is a clear mucous membrane consisting of cells and underlying basement membrane that covers the sclera and lines the inside of the eyelids.


Q. 5

Melanocytes in conjunctiva are derived from ‑

 A

Neural ectoderm

 B

Surface ectoderm

 C

Mesoderm

 D

Neural crest

Q. 5

Melanocytes in conjunctiva are derived from ‑

 A

Neural ectoderm

 B

Surface ectoderm

 C

Mesoderm

 D

Neural crest

Ans. D

Explanation:

Ans. is ‘d’ i.e., Neural crest

Quiz In Between



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.
Don’t Forget to Solve all the previous Year Question asked on CONJUNCTIVA

Module Below Start Quiz

Malcare WordPress Security