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Integumentary System

5.1--Structure of the Skin

TermDefinition
INTEGUMENTARY SYSTEM COMPOSED OF SKIN, HAIR, OIL AND SWEAT GLANDS, NAILS, AND SENSORY RECEPTORS.
SKIN (CUTANEOUS MEMBRANE) COVERS EXTERNAL SURFACE OF BODY; LARGEST ORGAN
EPIDERMIS SUPERFICIAL THIN LAYER OF SKIN; AVASCULAR EPITHELIAL TISSUE
DERMIS DEEP THICK LAYER OF SKIN; VASCULAR CONNECTIVE TISSUE (DENSE IRREGULAR CONNECTIVE TISSUE)
SUBCUTANEOUS NOT PART OF SKIN; CONSISTS OF AREOLAR AND ADIPOSE TISSUES (LOOSE CONNECTIVE TISSUES)
TYPES--KERATINOCYTES PRODUCE KERATIN; A TOUGH FIBROUS PROTEIN THAT HELPS PROTECT SKIN AND UNDERLYING TISSUES FROM ABRASIONS, HEAT, MICROBES AND CHEMICALS; ALSO WATER REPELLANT SEALANT (90%)
TYPES--MELANOCYTES PRODUCE PIGMENT MELANIN. CUBOIDAL. # OF MELANIN DETERMINES COLORATION (8%)
MELANIN PIGMENT THAT CONTRIBUTES TO SKIN COLOR AND ABSORBS DAMAGING UV LIGHT
TYPES--LANGERHANS CELLS IMMUNE RESPONSES AGAINST MICROBES
TYPES--MERKEL CELLS TACTILE; TOUCH SENSATION
FUNCTIONS OF SKIN Regulate body temp, store blood, protect body from external environ., detect cutaneous sensations, excrete and absorb, synth VitD
THIN SKIN FOUR LAYERS OF EPIDERMIS (STRATUM BASALE, SPINOSUM, GRANULOSUM, AND CORNEUM). HAS HAIR.
THICK SKIN FIVE LAYERS OF EPIDERMIS (STRATUM BASALE, SPINSOSUM, GRANULOSUM, LUCIDUM, CORNEUM). NO HAIR.
STRATUM BASALE DEEPEST LAYER OF EPIDERMIS; SINGLE ROW OF CUBOIDAL OR COLUMNAR KERATINOCYTES. KERATIN PROTECTS DEEPEST LAYER FROM INJURY
STRATUM SPINOSUM SUPERFICIAL TO STRATUM BASALE. CONTAINS NUMEROUS KERATINOCYTES. COARSER BUNDLES; MAKES IT STRONGER AND FLEXIBLE. (8-10 ROWS)
STRATUM GRANULOSUM KERATINOCYTES IN APOPTOSIS. INCLUDES KERATOHYALIN (A KERATIN PRECRUSOR). LIPID RICH REGION IS WATER REPELLANT (3-5 ROWS)
STRATUM LUCIDUM THICK SKIN AREAS. LAYERS OF DEAD KERATINOCYTES (4-6 ROWS)
STRATUM CORNEUM CORNEOCYTE PRESENCE (SQUAMES). NO NUCLEI. CORNIFIED LAYER. FRICTION-->CALLUS (25-30 ROWS)
Created by: 100000434525601