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A&P. Chapter 4 Notes SKIN & BODY MEMBRANES. SECTION 1. CLASSIFICATION OF BODY MEMBRANES. BODY MEMBRANES. EPITHELIAL MEMBRANES CUTANEOUS MEMBRANE MUCOUS MEMBRANE SEROUS MEMBRANE CONNECTIVE TISSUE SYNOVIAL MEMBRANES. CUTANEOUS MEMBRANES. IS THE SKIN
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A&P Chapter 4 Notes SKIN & BODY MEMBRANES
SECTION 1 CLASSIFICATION OF BODY MEMBRANES
BODY MEMBRANES • EPITHELIAL MEMBRANES • CUTANEOUS MEMBRANE • MUCOUS MEMBRANE • SEROUS MEMBRANE • CONNECTIVE TISSUE • SYNOVIAL MEMBRANES
CUTANEOUS MEMBRANES IS THE SKIN STRATIFIED SQUAMOUS EPITHELIUM (KERATINIZED) UNDERLYING DERMIS = D.F.C.T. EXPOSED TO AIR IS A DRY MEMBRANE
MUCOUS MEMBRANES COMPOSED OF EPITHELIUM RESTS ON L.C.T. LAMINA PROPRIA LINES ALL BODY CAVITIES OPENING TO EXTEROR RESPIRATORY, DIGESTIVE, URINARY, REPRODUCTIVE
MUCOUS MEMBRANES STRATIFIED SQUAMOUS (MOUTH/ESOPHAGUS) OR SIMPLE COLUMNAR (DIG. TRACT) ALL ARE “WET”/MOIST MEMBRANES BATHED IN SECRETIONS (pg. 96)
SEROUS MEMBRANES • SIMPLE SQUAMOUS EPITHELIUM • RESTS ON AREOLAR C.T. • LINE BODY CAVITIES THAT ARE CLOSED TO THE EXTERIOR • OCCUR IN PAIRS: • PARIETAL – LINES ON VENTRAL BODY CAV. • VISCERAL – COVERS THE OUTSIDE OF THE ORGANS IN THAT CAVITY
SEROUS MEMBRANES SEROUS LAYERS ARE SEPARATED BY SEROUS FLUID – SECRETED BY BOTH PARIETAL & VISCERAL MEMBRANES FLUID ALLOWS ORGANS TO SLIDE ACROSS CAVITY WALLS & EACH OTHER W/O FRICTION
SEROUS MEMBRANES • NAMES OF SEROUS MEMBRANES = LOCATION • PERITONEUM-LINES THE ABDOMINAL CAVITY & COVERS THOSE ORGANS • PLEURA-SURROUND THE LUNGS; KEEPS LUNGS SEPARATE FROM THE HEART • PERICARDIUM-SURROUNDS THE HEART; KEEPS SEPARATE FROM THE LUNGS
CONNECTIVE TISSUE MEMBRANES AKA-SYNOVIAL MEMBRANES SOFT, AREOLAR C.T NO EPITHELIAL CELLS LINE FIBROUS CAPSULES THAT SURROUND JOINTS LINE BURSAE SACS & TENDON SHEATHS PROVIDE SMOOTH SURFACE & SECRETE A LUBRICATING FLUID
CONNECTIVE TISSUE MEMBRANES • BURSAE & TENDON SHEATHS– CUSHION ORGANS MOVING AGAINST EACH OTHER DURING MOVEMENT • TENDON MOVES ACROSS A BONY SURFACE
SECTION 2 INTEGUMENTARY SYSTEM
INTEGUMENTARY SYSTEM EXTERNAL COVERING OF THE BODY SKIN WATERPROOFS, CUSHIONS, PROTECTS REGULATE BODY TEMPERATURE SENSE PAIN
INTEGUMENTARY SYSTEM • SKIN = CUTANEOUS MEMBRANE • FUNCTION=PROTECT • PARTS OF SKIN: • SWEAT GLANDS • OIL GLANDS INTEGUMENTARY • HAIR SYSTEM • NAILS
BASIC SKIN FUNCTIONS EXTERNAL COVERING KEEPS WATER IN & OUT PLIABLE & TOUGH = PUNISHMENT INSULATES & CUSHIONS DEEPER ORGANS PROTECTS FROM MECHANICAL, CHEMICAL & THERMAL DAMAGE PG 98
STRUCTURE OF SKIN • LAYERS OF SKIN: • EPIDERMIS: • STRATIFIED SQUAMOUS E.T. • KERATINIZES – TOUGHENS THE LAYER • DERMIS: • D.C.T. • FIRMLY CONNECTED TO EPIDERMIS • BLISTER=DERMIS & EPIDERMIS SEPARATE
STRUCTURE OF SKIN • DERMIS:2 MAJOR REGIONS • PAPILLARY – PG 102 • UPPER DERMAL • MEISSNER’S CORPUSCLES-TOUCH RECEPTORS
STRUCTURE OF SKIN • DERMIS:2 MAJOR REGIONS • RETICULAR – PG 102 • DEEPEST SKIN LAYER • BLOOD VESSELS, SWEAT/OIL GLANDS, PRESSURE RECEPTORS (PACINIAN CORPUSCLES)
STRUCTURE OF SKIN • DERMIS:2 MAJOR REGIONS • COLLAGEN & ELASTIC FIBERS-TOUGHNESS, ELASTICITY, HYDRATION • RICH NERVE SUPPLY • PG. 102
STRUCTURE OF SKIN • LAYERS OF SKIN: • EPIDERMIS: • DERMIS: • HYPODERMIS: • BELOW THE DERMIS • ADIPOSE TISSUE (SUBCUTANEOUS) • ANCHORS UNDERLYING ORGANS • SHOCK ABSORBER • INSULATES
EPIDERMIS COMPOSED OF 5 LAYERS (STRATA): STRATUM BASALE SPINOSUM FROM GRANULOSUM INSIDE LUCIDUM OUT CORNEUM
EPIDERMIS • AVASCULAR • CELLS ARE KERATINOCYTES – CELLS THAT PRODUCE TOUGH, PROTECTIVE LAYER 1. STRATUM BASALE DEEPEST LAYER OF EPIDERMIS • UNDERGOING CELL DIVISION • MILLIONS OF NEW CELLS DAILY
EPIDERMIS 2. STRATUM SPINOSUM 3. STRATUM GRANULOSUM 4. STRATUM LUCIDUM • ONLY WHERE SKIN IS HAIRLESS & THICK • PALMS OF HANDS & SOLES OF FEET
EPIDERMIS 5. STRATUM CORNEUM • OUTERMOST LAYER • 20-30 CELLS LAYERS THICK • CELLS ARE REPLACED BY CELLS FROM DEEPER STRATUM BASALE
EPIDERMIS • MELANIN • COLOR PIGMENT FROM YELLOW – BROWN – BLACK • PRODUCED BY MELANOCYTES (STRATUM BASALE) • FRECKLES/MOLES – MELANIN CONCENTRATED IN ONE SPOT
ALTERATIONS IN SKIN COLOR ERYTHEMA PALLOR BLANCHING PAGE 103 JAUNDICE BRUISES
SECTION 3 SKIN APPENDAGES
APPENDAGES OF SKIN CUTANEOUS GLANDS HAIR HAIR FOLLICLES NAILS ALL ARISE FROM EPIDERMIS
CUTANEOUS GLANDS • ALL ARE EXOCRINE GLANDS • RELEASE SECRETIONS TO SKIN SURFACE VIA DUCTS • 2 CATEGORIES: • SEBACEOUS • SWEAT FORMED BY STRATUM BASALE
SEBACEOUS GLANDS “OIL” GLANDS NOT IN PALMS/HANDS; SOLES/FEET DUCT EMPTIES INTO HAIR FOLLICLE OR TO SKIN SURFACE PRODUCE SEBUM- PG. 103 WHITEHEAD, BLACKHEAD, SEBORRHEA
SWEAT GLANDS • SUDORIFEROUS GLANDS • 2.5 MILLION PER PERSON!!!! • 2 TYPES OF SWEAT GLANDS: • ECCRINE GLANDS • APOCRINE GLANDS
ECCRINE GLANDS SWEAT GLAND MORE NUMEROUS PRODUCE SWEAT (PERSPIRATION ) TO THE SURFACE VIA A PORE HEAT REGULATION NERVE ENDINGS TO “READ” & SECRETE SWEAT
APOCRINE GLANDS AXILLARY & GENITAL AREAS DUCTS EMPTY INTO HAIR FOLLICLES SECRETION HAS FATTY ACID & PROTEIN& IS ODORLESS BACTERIA LIVE ON SKIN FOR USE OF PROTEINS/FATS - ODOR
HAIR • FUNCTION: • PROTECTION • HAS LOST ITS USEFULNESS • PRODUCED BY A FOLLICLE
HAIR PARTS: PG. 105 ROOT –PART OF HAIR ENCLOSED IN THE FOLLICLE SHAFT-PART PROJECTING FROM THE SURFACE OF SKIN/SCALP HAIR BULB MATRIX-INFERIOR END OF FOLLICLE; “GROWTH ZONE”; DIVISION OF STRATUM BASALE EPITHELIAL CELLS
HAIR PIGMENT – MELANOCYTES VARIETY OF SIZE & SHAPE ABSENT FROM PALMS, SOLES, NIPPLES, & LIPS BORN W/ ALL THE FOLLICLES THAT YOU WILL EVER HAVE PUBERTY – “HAIRIER” REGIONS
HAIR FOLLICLE • INNER EPIDERMAL SHEATH • OUTER DERMAL SHEATH • SUPPLIES BLOOD VESSELS TO EPIDERMAL PORTION • ARRECTOR PILI – SMOOTH MUSCLE CELLS; PG. 106; GOOSEBUMPS
NAIL • SCALELIKE MODIFICATION OF EPIDERMIS • PARTS: • FREE EDGE • BODY-VISIBLE; ATTACHED PORTION • ROOT-EMBEDDED IN SKIN • NAIL FOLD-CUTICLE • NAIL BED-STRATUM BASALE BENEATH THE NAIL • NAIL MATRIX-RESPONSIBLE FOR NAIL GROWTH
SECTION 4 SKIN ISSUES INFECTIONS/ ALLERGIES/ BURNS/CANCERS
SKIN INFECTIONS/ALLERGIES ATHLETE’S FOOT BOILS/CARBUNCLES COLD SORES PAGE CONTACT DERMATITIS 107 IMPETIGO PSORIASIS
BURNS • SEVERE DAMAGE & CELL DEATH CAUSED BY: • INTENSE HEAT • ELECTRICITY • UV RADIATION (SUNBURN) • CHEMICALS (ACIDS)
BURNS MOST THREATENING TO SKIN CELLS ARE DESTROYED BODY LOSES ITS SUPPLY OF FLUIDS (PROTEINS & ELECTROLYTES) DEHYDRATION – KIDNEYS SHUT DOWN; RESULTING IN SHOCK LOST FLUIDS MUST BE REPLACED
RULE OF 9’S - BURNS VOL. OF FLUID LOST CAN BE ESTIMATED BY DETERMINING BODY SURFACE THAT IS BURNED BODY IS DIVIDED INTO 11 AREAS EACH AREA = 9% OF SURFACE AREA PG. 108
SEVERITY OF BURNS • FIRST DEGREE • ONLY EPIDERMIS IS DAMAGED • RED & SWOLLEN • NOT USUALLY SERIOUS • SECOND DEGREE • THIRD DEGREE
SEVERITY OF BURNS • FIRST DEGREE • SECOND DEGREE • EPIDERMIS & UPPER DERMIS • RED WITH BLISTERS • EPITHELIAL CELLS STILL PRESENT FOR REGENERATION TO OCCUR • NO PERMANENT SCARRING • THIRD DEGREE
SEVERITY OF BURNS • FIRST DEGREEPARTIAL THICKNESS • SECOND DEGREEBURNS • THIRD DEGREE – FULL THICKNESS BURN • DESTROY ENTIRE THICKNESS OF SKIN • BLANCHED/BLACKENED • NERVE ENDINGS DESTROYED; NO PAIN • REGENERATION NOT POSSIBLE • SKIN GRAFTING MUST BE DONE
SKIN CANCER MOST ARE BENIGN (DO NOT SPREAD) SOME MALIGNANT (DO SPREAD) MOST COMMON TYPE OF CANCER IN HUMANS RISK FACTORS = EXPOSURE TO UV RADIATION IN SUNLIGHT; FREQUENT IRRITATION TO SKIN BY INFECTIONS, CHEMICALS, PHYSICAL TRAUMA
BASAL CELL CARCINOMA LEAST MALIGNANT MOST COMMON SKIN CANCER STRATUM BASALE CELLS DO NOT FORM KERATIN NO BOUNDARY B/T EPIDERMIS & DERMIS PROLIFERATE & INVADE DERMIS & SUBCUTANEOUS TISSUE PG. 109