What are the functions of the skin?. Derivatives of the Skin.

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Presentation transcript:

What are the functions of the skin?

Derivatives of the Skin

Sweat Glands ~3 million of them throughout the body! Per person!

Eccrine Sweat Glands Releases into skin surface Most abundant sweat glands Also on soles, palms, and forehead Secretory part in dermis

What makes you sweat

Apocrine Sweat Glands Empty into hair follicles Larger then eccrine Axillary and anogenital areas Fatty and protein substances Milky and Yellowish color… oooo! Released during pain, stress, and sex?

Ceruminous Glands Release earwax!

Mammary Glands Secrete milk! We’ll talk about them a little bit later

Sebaceous Glands Oil glands – all over body Produce sebum Release into hair follicle – Maybe a pore Hormones stimulate

Hair and Hair Follicles What is the point? Some people get a lot… lucky!

Some people don’t get any 

Hair Growths of the epidermis variously distributed over the body. Dead keratinized cells DIVIDED INTO TWO MAJOR DIVISIONS: 1. THE ROOT 2. THE SHAFT

THE ROOT Portion just below the surface that penetrates into the dermis. Surrounding the root is a hair follicle At the base of each follicle is an enlarged structure called a bulb.

Hair Follicle Each follicle gets – Arrector pilli – smooth muscle – Nerves! – root hair plexus – Hair papilla – capillaries!

NAILS Hard keratinized cells of the epidermis 3 parts: 1. Nail body- portion that is visible 2. Free edge-Any part that may project beyond the distal end of the digit. 3. Nail root-Hidden in proximal nail groove

Structure of a hair follice

Hair Growth