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A&P OF SKIN by Mind Map: A&P OF SKIN

1. Divided into 3 main layers:

1.1. Epidermis (outer) Dermis (middle) Hypodermis (inner)

1.1.1. EPIDERMIS

1.1.1.1. Outermost layer of skin

1.1.1.2. Composed of stratified keratinized squamous epithelium

1.1.1.3. LAYERS OF EPIDERMIS It contain 5 layer:- Stratum Corneum (outer layer) Stratum Lucidium (only in thick skin) Stratum Granulosum Stratum Spinosum Stratum Basale (bottom layer)

1.1.1.4. There are no blood vessels or nerve endings in the epidermis

1.1.1.5. to protects the body from friction & water loss

1.1.2. DERMIS

1.1.2.1. Formed from connective tissues and the matrix

1.1.2.2. contains collagen fibers interlaced with elastic fibers

1.1.2.2.1. Dermis has 2 layers:-

1.1.2.2.2. Papillary layer

1.1.2.2.3. Reticular layer

1.1.2.3. which give strength and flexibility to the skin.

1.1.3. HYPODERMIS

1.1.3.1. Innermost layer of skin

1.1.3.2. The fat stored represent an energy source for the

1.1.3.3. body and helps to insulate body againts changes in the outside temperature

2. OVERVIEW

2.1. Weigh around 4.5kg - 5kg 0.5mm - 4mm thick Thinnest on the eyelids Thickest on the heels (1mm - 2mm)

3. FUNCTIONS

3.1. Thermogulation

3.1.1. Temperature (37℃) is regulated by blood vessels dilation & constriction in the dermis of skin

3.2. Sensation

3.2.1. Receptor site for changes in temperature such as cold& hot & pressure such as pleasure&pain

3.3. Protection

3.3.1. Prevent the entrance of foreign body into body

3.4. Secretion

3.4.1. Eliminate the toxic in our body by sweating.

3.5. Synthesis of Vitamin D

3.5.1. stores vitamin D through exposure to ultraviolet rays of the sun.