front 1 Biggest Organ | back 1 Skin - protects body from infection, extreme temps, balance of fluids and synthesizes vit d. |
front 2 Epidermis | back 2 - composed of epithelial cells ( the outer most ) ( stratified squamous ) aka. multiple layers set on top of each other. ( like bricks ) - made up of keratinocytes |
front 3 Dermis | back 3 - composed of dense connective tissues. ( sweating, circulating blood, feeling everything. ) - underlying ( the bulk of the skin ) |
front 4 Hypodermis ( Subcutaneous ) | back 4 - composed of adipose / fatty tissues. |
front 5 Integumentary System Consist of | back 5 Hair, Nails, Skin, Sweat, Oil glands. |
front 6 4 different epidermis cell | back 6 - keratinocytes - melanocyte - dendritic cells ( langerhans cells ) - tactile epithelial cells. ( merkel cells ) |
front 7 2 /3 layers of the skin | back 7 - Epidermis - Dermis - Subcutaneous Tissue / hypodermis / superficial fascia " a bond " ( bc it wraps around the skeletal muscle ) ( not part of the skin ) |
front 8 keratinocytes | back 8 the building blocks of the tough fibrous protein keratin. -> ( gives structure, durability, and waterproofing to everything ) |
front 9 Keratin Cell | back 9 - found in epidermis - constantly dies and gets replaced. - loses a million everyday 4-6 weeks it will get replaced. - arise from the deepest part of skin ( stratum basale ) |
front 10 Melanocyte | back 10 - another epidermal cell - synthesizes melanin -> ( gives pigment skin its color ) - shaped like a spider |
front 11 Dendritic Cells ( Langerhans Cells ) | back 11 - kinda star shaped - originate in bone marrow then migrate to the epidermis. - ingest foreign substances. |
front 12 Tactile epithelial cells. ( merkel cells ) | back 12 - A combine with nerve endings to create a sensory receptor for touch. - spiky hemisphere ( blue cell ) |
front 13 Cellular Extensions | back 13 the reason why people have different skin colors. which affect the amount of melanin they contain. |
front 14 Thick / Thin Skin | back 14 Thick : tougher parts of the palms of hands, and soles of feet with consisting of 5 epidermal layers. Thin : everything else with 4 layers. ( does not have stratum lucidum ) |
front 15 5 layers of epidermis | back 15 - stratum basale - Stratum Spinosum - Stratum Granulosum - Stratum Lucidum - Stratum Corneum |
front 16 Statum Corneum | back 16 - " horny layer " - the outermost layer and roughest - 20/30 bed sheets of ke |
front 17 Stratum Lucidum | back 17 - "clear layer " - 2/3 rows of flat dead keratinocytes. |
front 18 Stratum Granulosum | back 18 - more serious layer bc it contains living keratinocytes that are forming keratin like crazy - Cells matures as they go up to the layers. |
front 19 Avascular | back 19 Oxygen and nutrients comes from the dermis below. |
front 20 Stratum Spinosum | back 20 - cells looks prickly when dehydrated - |
front 21 Stratum Basale | back 21 - Deepest and thinnest epidermal layer - single layer of columnar cells but like cell factory due to new-cell production - layer that connects to epidermis and dermis. |
front 22 Pneumonic for the layers | back 22 Come lets get sunburn |
front 23 Dermis function | back 23 collagen & elastic fibers - with capillaries, blood vessels and nerve fibers ( temperature , pressure and sweat glands, oils, hair follicles. ) |
front 24 Dermis has 3 layers | back 24 - Upper ( Papillary ) thin sheet of areolar connective ( papillae ) Friction ridges ( in order to grip things ) - Reticular Layer ( 80% ) made up of dense irregular tissues. ( bleed and feel pain ) - Basal layer. ( hypodermis ) adipose connective tissues ( seam of fat ) - insulation, energy storage, shock absorption and helps anchor the skin. |