Skin and Body Membranes

I. BODY MEMBRANES-- less complicated than organs A. Mucous Membranes 1. *Produce what substance? Why? 2. *Where located? Serous Membranes 2. *Substance produced? 3. *Where located? 4. Number of layers I. BODY MEMBRANES-- less complicated than organs

II) INTEGUMENTARY SYSTEM A. Functions: see Table 4.1 B. Structure & Major Layers: *Epidermis define *Dermis define *Below Skin = Subcutaneous (Hypodermis) define

C. Epidermis– Sub-Layers Figure 4.3

C. EPIDERMIS *Type of Tissue: 2. Sub-Layers a. Stratum Basale ("germinativum) i) *Location & # layers ii) Cells it Contains: Keratinocytes & Function Melanocytes & Function iii) Function b) Stratum Spinosum EPIDERMIS Stratum Basale

c) Stratum Granulosum *Has what structures? Condition of cells? d) Stratum Lucidum Cells Dead *Location: only where? e) Stratum Corneum- *Location? *# layers: Condition of Cells? Function Stratum Granulosum Stratum Spinosum

e) Stratum Corneum- *Location? *# layers: Condition of Cells? Epidermis … e) Stratum Corneum- *Location? *# layers: Condition of Cells? Cells are filled with: *Function Stratum Corneum

D. DERMIS– Bottom Layer 1. *Major Type Tissue Fibers: Many Blood vessels Two sub-layers a) Papillary layer Location: Structures present: pain and touch receptors b) Reticular layer Dense Connective Tissue Blood vessels Has: Sweat & Oil Glands Deep Pressure Receptors DERMIS

E. SUBCUTANEOUS TISSUE– HYPODERMIS Function: Tissue:

G. Skin Homeostatic Imbalances … 1. Burns b) Types– Severity of Burns i) First-degree burns *layers: Condition of Skin ii) Second-degree burns *layers

iii) Third-degree burns *layers Characteristics c. Critical Burns i) Second-Degree Amount: over 25% body ii) Third-Degree Amount: over 10% body AND/OR: includes: Face, Hands, and Feet d. Dangers of Critical Burns: dehydration electrolyte imbalance shock

2. Skin Cancer Basal Cell Carcinoma *Malignancy *Cause: Skin layer Characteristics ii) Squamous Cell Carcinoma

iii) Malignant melanoma Cure Rate Cell layer and cells *Cause Metastasizes *Characteristic– color Detection: ABCDE Rule A = Asymmetry B = Border C = Color D = Diameter > 6 mm E = Elevation

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