Date post: | 30-Dec-2015 |
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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