Thin skin -- present on most of the body and similar in many respects to thick skin, but much thinner overall, with hair follicles and without the features for detecting and protecting against pressure/friction.

Examine slides 36 and 157,

• Note the differences in thin skin with regard to the dermis and the epidermal strata (Fig. 18-3).
• Identify melanocytes (Fig. 18-6), which are also seen on slide 5.

What is the mechanism by which keratinocytes become pigmented?

Clinical note: Vitiligo is an acquired patchy loss of pigment in the skin, due to a localized autoimmune reaction to the melanocytes.

Now for skin appendages.