Chapter 5 Nail Structure and growth
What does a longer matrix lead to?
Faster nail growth
The average rate of nail plate growth in adult is about
1/10 to 1/8 (0.25 to 0.32 cm) per month
What is the water content of a healthy nail?
15%-25%
A tough band of fibrous tissue that bones or keeps an organ in place is called
A ligament
The natural nail unit includes
All parts of the finger from the top to the second knuckle
Which of the filling is not a natural nail shape?
Almond
Ordinarily complete nail plate replacement for a fingernail takes about ______
Four to six months
Identify a function of the hyponychium
It forms a protective barrier that keeps microorganisms from infectiong the nail bed
Which of the following statements is true of the nail plate?
It is the hardened keratin plate that rests on top of the nail bed
Which of the following statements best describes the lunula
It is the whitish, half moon shape under the nail plates base
Identify a characteristic of a healthy nail
It is translucent and the beige or pinkish color of the nail bed shows through
The natural nail unit is mainly made up of ______, which is fiber shaped protein found in skin and hair
Keratin
The ______ is part of the natural nail that contains nerves,blood vessels, and lymph to nourish cells that differentiate and become keratinized to form the nail plate
Matrix
The _______ is the section of living skin that supports the nail plate as it extends toward the free edge.
Nail bed
Which of the following statements is true of nail growth rates
Nail growth rates generally decrease with age
The natural nail is technically called
Onyx
The nail bed, nail fold, eponychium,paronychium and hyponychium are collective referred to as the
Perionychium
The ______ is the whole skin flap that covers the matrix, from the visible nail plates edge to the first joint of the finger or toe.
Proximal nail fold
Identify a difference between the cuticle and the eponychium
The cuticle is the dread tissue stuck to the nail plate, whereas the eponychium is the living skin under the proximal mail found at the nails plates base covering the matrix area
Which of the following is not part of the perionychium
The distal phalanx
Which of the grows the fastest?
The nail of the middle finger
Which of the following statements is true of growth of the nail plate
The nail plates growth is affected by nutrition, exercise and overall health
Cosmetologists should have a thorough understanding of nail structure and growth because
They must be able to differentiate between the mail and cuticle and the eponychium before performing nail services
Identify a reason why cosmetologist should be knowledgeable about nail structure and growth
Understanding nail structure nail helps cosmetologist disowns treat irregular nail conditions