Gross Anatomy
The skin is the body's largest organ, both in outer surface area and in mass. It varies greatly in different locations on the body, notably being thickest on the upper back and thinnest on the eyelids. The skin's functions are numerous, and include protection, thermoregulation, sensation, metabolic functions, wound repair, communication, and even physical attraction.
Three major layers compose the structure of the skin. They are:
Three major layers compose the structure of the skin. They are:
- Epidermis - the major permeability barrier (water tight), innate immune function, UV radiation protection, and adhesion
- Dermis - the major structural element of skin, composed of cell bodies, the fibrous matrix, and the diffuse and filamentous matrix. The dermis is also the layer that receives the blood supply, lymphatics, and nerve connections
- Hypodermis (subcutis)- contains adipose tissue for insulation, provides mechanical integrity, and contains the larger source of vessels and nerves
Skin Histology
More anatomy and histology to come