What kind of hairs do you have?
The skin Adnexa
Hair
Nail
Sweat
gland
sebaceous
gland
Hair
The types
of hairs
Lanugo hairs
Hairs are
soft and thin. They only happened to the newborn baby.
Vellus hairs
They are
only 1-2cm height without melanin.
They don’t have sebaceous gland and won’t excrete lipid.
Terminal hairs
They are
coarse and long hairs with glands. Especially on head, arm, and leg.
Hair
Hairs
have their life. They continue to grow, fall off, and new born. It can be
defined to 3 periods. They are Anagen, Catagen, and Telogen. It falls off
70-120 hairs every day.
Dermal
papilla
It is the
recess of hair bulb. There are cells next to edge to get the nutrition from blood capillaries. The cell divisions will
become new hairs. If cells are damaged, the hairs won’t grow any more.
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