Presentation is loading. Please wait.

Presentation is loading. Please wait.

Integumentary System Epidermis Skin Color & Cancer Dermis

Similar presentations

Presentation on theme: "Integumentary System Epidermis Skin Color & Cancer Dermis"— Presentation transcript:

1 Integumentary System Epidermis Skin Color & Cancer Dermis
Hair, Nails & Glands Temperature Regulation Wounds & Healing

2 The Skin & Its Tissues

3 View of Skin & Underlying Tissues

4 Inhabitants of the Epidermis

5 Epidermal Layers - Blisters, Calluses &Psoriasis
Composed primarily of keratinized stratified squamous epithelial cells -- consisting of 4-5 layers: stratum corneum: outermost layer, keratinized dead epithelium stratum lucidum: layer found in thickest areas of skin stratum granulosum: 3-5 layers of flattened granular cells, developing keratin fibers stratum spinosum: multiple layers of cells stratum basale: deepest layer of single cuboidal or columnar cells, also contains melanocytes - Blisters, Calluses &Psoriasis

6 Melanocytes Specialized cells in epidermis produce melanin
dark pigment providing skin color cells lie in stratum basale cytocrine secretions: cellular extension absorbs UV radiation in sunlight protects dermis

7 Skin Color - Genetics, Environment & Physiology:
# of melanocytes - difference in kind, amount & size sunlight, UV light, etc. blood in dermis, blood vessels, freckles & moles other pigments - carotinoids jaundice – liver disorder

8 Skin Cancer
Squamous cell Basal cell carcinoma Malignant melanoma carcinoma

9 Dermis: 2 layers Dense CT: composed of collagen, elastin & reticular fibers: unevenness b/t layers (dermal papilae) form fingerprints (epidermal ridges) delivers nutrients & O2 to epidermal cells binds epidermis to underlying tissue contains muscle fibers (facial expressions) nerve cells are distributed throughout (e.g., Meissner’s & Pacinian corpuscles) hair follicles, sweat & sebaceous glands

10 Dermis

11 Hair & Nails are Derivatives of Skin
Hair: protective function, found on most skin surfaces consisting of epidermal cells & keratin hair follicle: structure hair develops from hair root: portion below skin surface hair shaft: extends away from skin surface hair color: epidermal melanocytes arrector pili muscle: goose bumps sebaceous glands: associated w/ hair follicles, lubricate hair & skin androgenic alopecia

12 Hair Follicle


14 Nails: Protect Ends of Fingers & Toes
Specialized epithelial cells that keratinize; consist of nail plate & nail bed Lunula (1/2 moon shape region): active growing area of nail What can nail appearance indicate?

15 Skin Glands Sweat glands: Sebaceous glands:
- assoc. w/ hair follicles, secrete sebum - oils hair, lubricates skin & prevent water loss - acne vulgaris Sweat glands: Eccrine: deep in dermis or subcutaneous layer, odorless secretions, function in thermoregulation Apocrine: found near hair follicles, in axillary regions, released during pain, fear & stress or sexual arousal - Ceruminous & mammary glands

16 Eccrine & Apocrine Sweat Glands


18 Temperature Regulation
Homeostatic mechanism - receptor - control center - effectors

19 Body Temperatures Under Varying Conditions
heat exhaustion heat stroke fever hypothermia

20 Wounds & Healing Inflammation: normal response to injury or stress
Laceration: break in the skin epidermal cut: epithelial cells around injury proliferate & newly formed cells fill in dermal cut: clot forms (RBC, platelets, proteins) growth factors: induce migration of fibroblast & macrophages smooth muscle & fibroblasts stimulate tissue repair

21 Steps of Tissue Repair

Download ppt "Integumentary System Epidermis Skin Color & Cancer Dermis"

Similar presentations

Ads by Google