CH 5 Flashcards
Nails
thin plates consisting of layers of dead stratum corneum cells with hard keratin
Nail body
the visible part of the nail
Nail Root
Part of the nail covered in skin
How do nails grow?
Distally
Nail Fold
Holds the lateral and proximal edges of the nail in place
Eponychium (cuticle)
stratum corneum from the nail fold that extends onto the nail body
Nail matrix
- thick ET with a stratum basale (location of nail tissue formation)
- produces most of the nail
Nail bed
the location where the nail attaches, distal to the nail matrix
Lunula
part of the nail matrix visible through the nail body
What results in the growth of the nail?
the production of cells within the nail matrix
Do nails grow continually?
Yes, unlike hair
The average rate of nail growth?
0.5-1.2 mm per day
T/F: Nails have a resting stage
False, nails have NO resting stage
T/F: Fingernails have a greater growth rate than toenails?
True
Integumentary System: Protection: Skin
- protects underlying structures from abrasion
- prevents entry of microorganisms
- melanin absorbs UV light/ protects underlying structures
- lipids act as a barrier to reduce water loss