The Integumentary The Integumentary SystemSystem

Chapter 5Chapter 5

IntroductionIntroduction

The integumentary system consists of The integumentary system consists of hair, skin, and nails.hair, skin, and nails.

Skin accounts for approximately 7% of Skin accounts for approximately 7% of total body weight (9-11 lbs) and varies in total body weight (9-11 lbs) and varies in thickness (1.5 mm to 4.0 mm).thickness (1.5 mm to 4.0 mm).

Skin is composed of two distinct regions.Skin is composed of two distinct regions.

LAYERS OF SKINLAYERS OF SKIN

SKIN FUNCTIONSSKIN FUNCTIONS

ProtectionProtection Body temperature regulationBody temperature regulation Cutaneous sensationCutaneous sensation Metabolic functionsMetabolic functions Blood reservoirBlood reservoir Excretion of wastesExcretion of wastes

EPIDERMISEPIDERMIS

Cell TypesCell Types KeratinocytesKeratinocytes MelanocytesMelanocytes Langerhans’ cellsLangerhans’ cells Merkel cellsMerkel cells

EPIDERMISEPIDERMIS

LayersLayers Stratum basaleStratum basale Stratum spinosumStratum spinosum Stratum Stratum

granulosumgranulosum Stratum lucidumStratum lucidum Stratum corneumStratum corneum

DERMISDERMIS Underlies the epidermisUnderlies the epidermis

Composed of two layersComposed of two layers Papillary layer= areolar loose connective Papillary layer= areolar loose connective

tissuetissue Reticular layer= dense irregular Reticular layer= dense irregular

connective tissue (80%)connective tissue (80%)

Contains many nerve endingsContains many nerve endings

DERMISDERMIS

Review QuestionReview Question

What is the name of the inner-most What is the name of the inner-most layer of the epidermis?layer of the epidermis?

a. Hypodermisa. Hypodermis

b. Stratum basaleb. Stratum basale

c. Stratum corneumc. Stratum corneum

d. Dermisd. Dermis

e. Stratum lucidume. Stratum lucidum

Review QuestionReview Question

Which layer of the dermis contains Which layer of the dermis contains dense regular connective tissue?dense regular connective tissue?

a. Hypodermisa. Hypodermis

b. Papillary layerb. Papillary layer

c. Reticular layerc. Reticular layer

d. Stratum spinosumd. Stratum spinosum

e. Stratum granulosume. Stratum granulosum

SKIN PIGMENTATIONSKIN PIGMENTATION

MelaninMelanin

CaroteneCarotene

HemoglobinHemoglobin

ACCESSORY OGRANSACCESSORY OGRANS

Sweat glandsSweat glands EccrineEccrine ApocrineApocrine CeruminousCeruminous MammaryMammary

Sebaceous Sebaceous glandsglands

ACCESSORY ORGANSACCESSORY ORGANS

ACCESSORY ORGANSACCESSORY ORGANS

Review QuestionReview Question

Which of the following refers to a modified Which of the following refers to a modified sweat gland found in the external auditory sweat gland found in the external auditory meatus where it produces wax?meatus where it produces wax?

a. Apocrine glanda. Apocrine gland

b. Eccrine glandb. Eccrine gland

c. Sebaceous glandc. Sebaceous gland

d. Ceruminous glandd. Ceruminous gland

e. Mammary glande. Mammary gland

Review QuestionReview Question

Which of the following terms refers to the Which of the following terms refers to the cuticle of the nail?cuticle of the nail?

a. Eponychiuma. Eponychium

b. Hyponychiumb. Hyponychium

c. Lunulac. Lunula

d. Matrixd. Matrix

e. Roote. Root

SKIN DISORDERSSKIN DISORDERS

Skin cancerSkin cancer

SKIN CANCERSSKIN CANCERS

Skin Cancer Video

SKIN DISORDERSSKIN DISORDERS

Skin cancerSkin cancer BurnsBurns

SKIN DISORDERSSKIN DISORDERS

Rule of NinesRule of Nines

SKIN DISORDERSSKIN DISORDERS

Skin cancerSkin cancer BurnsBurns RosaceaRosacea

ROSACEAROSACEA

SKIN DISORDERSSKIN DISORDERS

Skin cancerSkin cancer BurnsBurns RosaceaRosacea DermatitisDermatitis Contact dermatitisContact dermatitis AcneAcne JaundiceJaundice

SeborrheaSeborrhea HirsutismHirsutism AlopeciaAlopecia ImpetigoImpetigo PsoriasisPsoriasis AlbinismAlbinism StriaeStriae