Chapter 2 Anatomy and Physiology of Adult Friction Ridge Skin

Epidermis, Dermis, Hypodermis

- Outermost layer of skin
- Protective barrier for underlying tissue
- Protects "Melanocytes" pigment producing cells
- Pigment shields DNA of "Keratinocyte" (primary cell type of epidermis)

- Layer of connective tissue that supports the Epidermis
- Network of cells, fibers, blood vessels and gelatinous material that provides structural support and nourishment to epidermis.
- Blood reserve
- Temperature regulation and sensory reception.

- Connective tissue that lies under the dermis
- Contains adipose cells (fat) which contours the body and serves as energy reserve.

Eccrine sweat gland

- Ridges and furrows on the surface are firmly rooted in the dermis by primary ridges (under the surface ridges) and secondary ridges (under the valleys).
- Primary and secondary ridges are interlocked with the dermis to provide support and strength to the friction ridge skin.

Keratinocytes, melanocytes, langerhans cells, merkel cells.

Keratinocyte, reinforces skin cells

Stratum Lucidum, Stratum Granulosum, Stratum Spinosum, Supra-basal layer, Stratum Basale.

- Innermost layer of the epidermis
- Consists of a single layer of keratinocytes, scattered melanocytes, and Merkel cells.