Appendages

Question 1

Layers and sublayers of hair

Answer 1

Hair shaft; Inner and outer root sheath; Glassy membr; CT sheath

Hair shaft:
Medulla ➡ Cortex ➡ Cuticle

Inner root sheath:
Cuticle ➡ Huxley layer ➡ Henley layer

Question 2

Vellus & terminal hair difference

Answer 2

Vellus - thin, unmedullated, bulb at reticular dermis
Terminal hair - thick medullated, bulb at subcutaneous tissue

Question 3

In __ vellus hair is converted to terminal hair.
In __ terminal hair is converted to vellus hair.

Answer 3

Hirsuitism: V to T
Androgenic alopecia: T to V

Question 4

Stages of hair cycle and proportion in each stage

Answer 4

Anagen - 86% - 3yrs
Catagen - 1% - 3wks
Telogen - 13% - 3mo
Exogen

Question 5

Hair growth rate

Answer 5

1cm/mo

Question 6

Autoimmune disease invoicing the anagen hair bulb. Appearance of hair at margins

Answer 6

Alopecia areata; exclamation mark

Question 7

Alopecia areata jail findings

Answer 7

Geometrical pitting -n fine superficial regular pits

Question 8

Patterns of hair loss in alopecia areata with poor prognosis

Answer 8

Ophiasis (occipital)
Totalis (entire scalp)
Universalis (body hair)