What are the layers of the skin? - ANSWER hypodermis, dermis, epidermis
What are the two classifications of hair? - ANSWER vellus and terminal
What is the follicle and its structure? - ANSWER Dermis
External Root Sheath
Inner Root Sheath:
Henle Layer
Huxle Layer
What are the layers of the skin? - ANSWER hypodermis, dermis, epidermis
What are the two classifications of hair? - ANSWER vellus and terminal
What is the follicle and its structure? - ANSWER Dermis
External Root Sheath
Inner Root Sheath:
Henle Layer
Huxle Layer
Cuticle
Structure of hair:
Cuticle
Cortex (melanin)
Medulla
Papilla
Blood vessels
What pulse duration and fluence should be used for skin type I, II, III (Lighter skin)? - ANSWER Use higher
fluences.
Use a shorter pulse duration.
Use a smaller spot size (optional)
, What pulse duration and fluence should be used for skin type IV, V, VI (darker skin) ? - ANSWER Use a
lower fluence.
Use a longer pulse duration.
Use a larger spot size (especially for dense and coarse hair).
Describe the catagen phase: - ANSWER Brief transitional stage.
Lasts only a few days to a few weeks.
Approx. only 1-2% of the hairs involved.
Hair follicle separates from papilla.
The hair shaft bulb is lighter or brown pigmented and drier.
Hair follicle shortens to 1/3 of its former length.
Describe the late catagen stage - ANSWER the thin cord of epidermal cells attaching the dermal papilla to
the shrunken hair follicle retracts upwards, followed by the underlying dermal hair papilla, which also
moves upwards.
Describe the telogen phase: - ANSWER Resting or dormant period.
Pigment cells are also dormant.
The papilla has detached from the follicle.
A 'Club" hair is a terminal hair separated from the papilla that has risen to the middle of the follicle- it
eventually falls out at the end of cycle.
The hair bulb is shrunken, white and consisting of keratinized hair matrix cells.
Length of telogen time varies widely according to type of hair, the area of the body and nature of the
individual.
Only hair germ cells from the outer root sheath and dormant dermal papilla cells remain at the lower
part of the follicle.
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