Cataract The cornea endothelium is derived from which structure? | OphthalmologyWeb: The Ultimate Online Resource for Ophthalmologists

Posted: April 17, 2008

The cornea endothelium is derived from which structure?

a) Neural crest
b) Endoderm
c) Mesoderm
d) Ectoderm

Correct Answer: Neural crest

The corneal endothelium is derived from the neural crest.

For more information on specular microscopes, click here.
For a video presentation by Kevin Corcoran "Medicare Reimbursement for Specular Microscopy", click here.

The steroid that is least likely to cause a posterior subcapsular cataract is:
1. dexamethsone
2. prednisolone
3. loteprednol
4. triamcinolone
check the answer
The Malyugin ring is least helpful in which of the following cases:
1. keratoconjuncivitis sicca
2. Bell’s Palsy
3. Neurotrophic keratitis
4. Rheumatoid arthritis
5. Keratoconjuncivitis sicca
6. chronic pilocarpine treatment
7. pseudoexfoliation syndrome
8. intraoperative floppy iris syndrome
9. ectopia lentis
check the answer
The following is a photograph after fluorescein staining of a 40 year old patient with complaints of gritty sensation OU for the past several months. All of the following might be expected except:
1. increased tear break-up time
2. decreased tear meniscus
3. 5mm Schirmer test
4. filamentary keratitis
check the answer
The following is a slit lamp photograph of a 60 year old woman with complaints of chronic foreign body sensation. Which of the following is the least likely cause of her condition?
1. keratoconjuncivitis sicca
2. Bell’s Palsy
3. Neurotrophic keratitis
4. Rheumatoid arthritis
5. Keratoconjuncivitis sicca
check the answer
All of the following are true of Sjögren Syndrome except:
1. hyaline
2. cholesterol
3. calcium
4. amyloid
check the answer

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