Anatomy

Question 1

Androgen effect on terminal hairs

Answer 1

@ Puberty, increases follicle size in chest/bear/limbs and decreases in bi-temporal region

Question 2

What two layers surround growing hair shaft

Answer 2

Outer and inner root sheath

Question 3

What layers make up the hair shaft once it has emerged

Answer 3

Outer cuticle, cortex, and sometimes an inner medulla (all dead protein)

Question 4

Hair follicles at birth

Answer 4

start with ~ 5 million follicles and get no more after birth (size influenced by androgens)

Question 5

Three sections in the hair follicle

Answer 5

Infundibulum (surface to the sebaceous gland duct)
Isthmus (sebaceous gland duct to insertion of the erector pili muscle)
Inferior segment which is only present during anagen/growing phase (goes to the base of the matrix)