Flashcards
A&P CH6
Flashcards do conjunto (27)
- 1This is the largest organ of the body and is approximately 15% of total body weightSkin
- 2Name the two layers of the skin-Epidermis
-Dermis - 3Two characteristics of the Epidermis-Made up of Stratified Squamous Epithelium
-Has 5 Layers - 4The Dermis is a layer of thisConnective Tissue
- 5These are the 5 Layers of the Epidermis-Stratum Basale
-Stratum Spinosum
-Stratum Granulosum
-Stratum Lucidum
-Stratum Corneum - 6Skin rests onSubcutaneous layer or Hypodermus
- 7Normal thickness of skin1-2mm but can be up to 6mm thick
- 8Stratum BasaleCuboidal or Low Columnar cells sitting on a Basement Membrane
- 9Stratum Basale Cell Types-Keratinocytes
-Melanocytes
-Merkel Cells - 10Stratum Basale KERATINOCYTES-Undergo Mitosis to
REPLACE EPIDERMIS
-Most of the cells of Epidermis - 11Stratum Basale MELANOCYTES-Synthesize Melanin
-Distribute Melanin from cell processes
-Melanin picked up by KERATINOCYTES & used to Shade Nuclei from UV Radiation - 12Stratum Basale MERKLE CELLSTouch Receptors associated with nerve fibers to form Merkel Disc
- 13Stratum Spinosum Characteristics-Several layers of Keratinocytes thick
-Contains Dendritic (Langerhans) cells - 14Stratum Spinosum Several Layers of Keratinocytes ThickAppear spiny due to shrinkage during histological preparation (Desmosomes)
- 15Stratum Spinosum Contains Dendritic (Langerhans) cells-Microphages from Bone Marrow that Migrate to Epidermis
-800 cells/mm2
-Help protect body from pathogens by "Presenting" them to the Immune System - 16Stratum Granulosum Characteristics-3 to 5 Layers of Flat Keratinocytes
-Contain Keratinohyalin Granules
(Last Living Layer)
-Produce Lipid-Filled Vesicles that Release a Glycolipid by Exocytosis to Waterproof the Skin - 17Stratum Granulosum Keratinohyalin GranulesIntermediate filaments Convert Granules to Keratin
- 18Stratum Granulosum Produce lipid-filled vesicles that release a glycolipid by ____________________exocytosis to waterproof the skin
-Forms a barrier between surface cells & deeper layers of the epidermis
-Cuts off surface strata from
nutrient supply - 19Stratum Lucidum Characteristics-Thin translucent zone seen only in thick skin
-Keratinocytes packed with eldin, a precursor to Keratin
-Cells have NO Nucleus or Organelles - 20Stratum Corneum (Think Corns on feet) -Have up to 30 layers of _______ -Surface cells-___dead, scaly, keratinized cells
-___flake off (Exfoliate) - 21Dermis Thickness.6 to 3mm
- 22Dermis Composition-Collagen
-Elastic Fibers
-Reticular Fibers
-Fibroblasts
-Accessory structures such as Hair Follicles & Glands - 23Dermis Dermal Papillae are upward extensions of the dermis into the epidermis forming ____________the ridges of the fingerprints
(used for friction) - 24Dermis Layers-Papillary layer
-Reticular layer - 25Dermis Papillary layer-Thin zone of Aereolar/Loose Connective Tissue in & near the Dermal Papillae of upper 20% of dermis
- 26Dermis Reticular Layer-Deeper, thicker part of dermis
-Composed of Dense Irregular Connective Tissue - 27Hypodermis is known as thisSubcutaneous tissue
or
Superficial Fascia