nails

Question 1

what is the function of nails

Answer 1

Protection
grip/claws
cosmetics/communication
touch (manual dexterity)

Question 2

What is the structure of nails

Answer 2

nail plate 
germinal matrix - dividing cells 
onychodermal band - seal - formed by 
eponychium 
hyponychium (thickened epidemis - underlie free margin of nail) 
dermal capillaries - make pink 
keratin 
longitudinal riding and curvature
lunula(matrix we can see) 
nail bed - make small amount of keratin

Question 3

How do nails grow

Answer 3

nails grow out not up
because of adhesion and nail folds
dividing cells from matrix mature and form cell plate

Question 4

rate of finger and toe nail growth

Answer 4

finger 3mm/month

toe 1mm/month