Do Now 9/2/14 List the layers of the epidermis from most superficial to most deep. Describe the structural differences between thin and thick skin. Describe the functions of the serous and synovial membranes and list a location where you could find each one. Explain at least 3 reasons why we have skin.

New School Supply!! I will expect for you to have a pad of sticky notes sitting on your desk at the beginning of every class.

Recap - Epidermis Come Let’s Get Sun Burned

Keratin & Melanin What is the purpose of each? What causes different skin color? What layers are keratinized?

Dermis Contains sweat glands and oil glands Comprised of connective tissue Innervated = many nerve fibers Vascular = contain blood vessels

1. Papillary layer (papilla = nipple) Areolar connective tissue Dermal papillae – projections of the dermis Interlock and increase contact area between epidermis & dermis Contain capillaries to provide nutrients from blood to the epidermis Contain sensory receptors

2. Reticular layer (reticular = net/web) Dense connective tissue Fibers surround the structures in the dermis (hair follicles, glands, nerves, blood vessels, etc) *Different than reticular connective tissue*

2. Reticular layer (reticular = net/web) Striae = stretch marks that result due to fibers torn or stretched past their capacity Flexibility of the dermis is decreased by UV light exposure and aging WRINKLES

Vasoconstriction vs. Vasodilation Define both terms Describe the effect on the body Relation to surface of skin Qualitative observations When would each be appropriate?

Subcutaneous Layer (hypodermis) Not actually part of the integument Areolar and adipose tissue Protects the body, stores energy, and provides insulation Vascular Drugs Thicker in women

Poster Time Include a visual diagram of the layers and sub-layers of the skin (epidermis, dermis, subcutaneous) You will also include a hair follicle, arrector pili muscle, and glands at a later time – so save room for them! Indicate where keratinization begins on the diagram and the purpose of this process Indicate where keratinocytes, melanocytes, and tactile cells can be found & include their purposes Include blood vessels and describe what happens when vasodilation and vasoconstriction occurs

Coming up… Integument poster due Wednesday, 9/10 Integumentary BIG QUIZ on Friday, 9/12 Hair lab soon…