MNT Nail Anatomy and Pathology 2

Question 1

Which nail finding is most characteristic of psoriasis?

Accepted Answer

Pitting, onycholysis, and oil-drop discoloration

Answer

Koilonychia (spoon nails)

Answer

Ram's horn deformity

Answer

Blue-gray lunula

Question 2

The nail plate is primarily composed of:

Accepted Answer

Hard keratin (alpha-keratin)

Answer

Collagen fibers

Answer

Calcium hydroxyapatite

Answer

Elastin and fibronectin

Question 3

Melanonychia striata refers to:

Accepted Answer

A brown or black longitudinal streak on the nail plate

Answer

Horizontal white bands on the nail

Answer

Nail plate fragmentation

Answer

Green discoloration from Pseudomonas

Question 4

What percentage of nail plate growth occurs from the nail matrix?

Accepted Answer

100%

Answer

20%

Answer

50%

Answer

75%

Question 5

Paronychia is defined as:

Accepted Answer

Infection and inflammation of the nail folds surrounding the nail plate

Answer

Separation of the nail from the nail bed

Answer

Fungal infection of the nail plate

Answer

Bruising under the nail

Question 6

The average growth rate of a healthy toenail is approximately:

Accepted Answer

1.5 mm per month

Answer

3–4 mm per month

Answer

5 mm per week

Answer

0.5 mm per month