Chapt06 Holes Lecture Animation[1]

Edited byBrenda Holmes

MSN/Ed, RNAssociate Professor

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South Arkansas Community College

Chapter 6

Integumentary System

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• Two or more kinds of tissues grouped together and performing specialized functions constitutes an organ.

• The skin and its various structures make up the integumentary system.

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• Composed of several tissue types• Maintains homeostasis• Protective covering• Retards water loss• Regulates body temperature• Houses sensory receptors• Contains immune system cells• Synthesizes chemicals• Excretes small amounts of wastes

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• Help produce Vitamin D needed for normal bone and tooth development

• Some cells (keratinocytes) produce substances that simulate development of some white blood cells

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• Epidermis• Dermis• Subcutaneous layer

• Aka hypodermis• Beneath dermis • Some also call it the superficial fascia• Some consider it not part of the skin

Stratifiedsquamousepithelium

Dense irregularconnectivetissue

Adipose tissue

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© The McGraw-Hill Companies, Inc./Al Telser, photographer

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(a)

Hair shaft

Epidermis

Hair follicle

(b)

Sebaceous gland

Dermis

Sweat

Epidermis

Dermis

Hair shaft

Sweat gland pore

Capillary

Stratum corneum

Stratum basale

Dermal papilla

Arrector pili muscle

Lamellated (Pacinian) corpuscle

Basement membrane

Sebaceous gland

Hair follicle

Sweat gland

Nerve cell process

Adipose tissue

Blood vessels

Muscle layer

Sweat gland duct

Subcutaneouslayer

TTactile (Meissner’s) corpuscle

• Lacks blood vessels• Keratinized• Thickest on palms and

soles (0.8-1.4mm)• Melanocytes provide melanin• Rests on basement membrane• Stratified squamous epithelia

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b: © Victor Eroschenko

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There are five (5) layers of the epidermis:• Stratum corneum• Stratum lucidum• Stratum granulosum• Stratum spinosum• Stratum basale

Stratum corneum

Stratum lucidum

Stratum granulosum

Stratum spinosum

Stratum basale

Basementmembrane

Dermis

Dermal papilla

(a) (b)

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b: © The McGraw-Hill Companies, Inc./Al Telser, photographer

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• Genetic Factors• Varying amounts of melanin• Varying size of melanin granules• Albinos lack melanin

• Environmental Factors• Sunlight• UV light from sunlamps• X-rays• Darkens melanin

• Physiological Factors• Dilation of dermal blood vessels• Constriction of dermal blood vessels• Accumulation of carotene• Jaundice

• Heredity and environment determine skin color

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Tanning and Skin Cancer

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• Contains dermal papillae

• Binds epidermis to underlying tissues• Irregular dense connective tissue

• On average 1.0-2.0mm thick

• Muscle cells

• Nerve cell processes• Specialized sensory receptors

• Blood vessels

• Hair follicles

• Glands

(a)

Sweat

Epidermis

Dermis

Hair shaft

Sweat gland pore

Capillary

Stratum corneum

Stratum basale

Dermal papilla

Arrector pili muscle

Lamellated (Pacinian) corpuscle

Basement membrane

Sebaceous gland

Hair follicle

Sweat gland

Nerve cell process

Adipose tissue

Blood vessels

Muscle layer

Sweat gland duct

SubcutaneousSubcutaneouslayer

Tactile (Meissner’s) corpuscle

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• Papillary layer• Thin• Superficial• Dermal papillae here

• Reticular layer• 80% of dermis• Cleavage, tension or Langer’s lines are here

• There are actually two (2) layers to the dermis:

(a)

Sweat

Epidermis

Dermis

Hair shaft

Sweat gland pore

Capillary

Stratum corneum

Stratum basale

Dermal papilla

Arrector pili muscle

Lamellated (Pacinian) corpuscle

Basement membrane

Sebaceous gland

Hair follicle

Sweat gland

Nerve cell process

Adipose tissue

Blood vessels

Muscle layer

Sweat gland duct

SubcutaneousSubcutaneouslayer

Tactile (Meissner’s) corpuscle

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• Aka hypodermis

• Loose connective tissue and …

• Adipose tissue are present

• Insulates

• Major blood vessels present (a)

Sweat

Epidermis

Dermis

Hair shaft

Sweat gland pore

Capillary

Stratum corneum

Stratum basale

Dermal papilla

Arrector pili muscle

Lamellated (Pacinian) corpuscle

Basement membrane

Sebaceous gland

Hair follicle

Sweat gland

Nerve cell process

Adipose tissue

Blood vessels

Muscle layer

Sweat gland duct

SubcutaneousSubcutaneouslayer

Tactile (Meissner’s) corpuscle

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• Accessory structures of the skin originate from the epidermis and include:

• Hair follicles• Nails• Skin glands

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• Epidermal cells

• Tube-like depression

• Extends into dermis

• Three (3) parts:• Hair root• Hair shaft• Hair papilla

• Dead epidermal cells

• Melanin• Arrector pili muscle

(a)

Hair shaft

Pore

Hair root(keratinizedcells)

Arrector pilimuscle

Sebaceousgland

Hair follicle

Region ofcell division

Hair papilla

Eccrinesweat gland

DermalDermalbloodvessels

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• Protective coverings

• Three (3) parts:• Nail plate• Nail bed

• Lunula

Nail bed Nail plateLunula

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Hair Loss

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• Usually associated with hair follicles

• Holocrine glands

• Secrete sebum (oil)

• Absent on palms and soles

Hair

Sebaceousgland

Hair follicle

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© Per H. Kjeldsen

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• Aka sudoriferous glands

• Widespread in skin

• Originates in deeper dermis or hypodermis

• Eccrine glands

• Apocrine glands

• Ceruminous glands

• Mammary glands

Dermalpapilla

Sebaceousgland

Duct

Hair shaft

Hairfollicle

Eccrinesweatgland

Apocrinesweatgland

Pore

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Acne

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• Regulation of body temperature is vitally important because even slight shifts can disrupt metabolic reactions.

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If body temperaturecontinues to drop,control center signalsmuscles to contractinvoluntarily.

too high

too low

Normal bodytemperature37°C (98.6°F)

Control centerHypothalamusdetects the deviationfrom the set point andsignals effector organs.

Control centerHypothalamusdetects the deviationfrom the set point andsignals effector organs.

StimulusBody temperature risesabove normal.

EffectorsDermal blood vesselsdilate and sweat glandssecrete.

ResponseBody heat islost to surroundings,temperature drops towardnormal.

EffectorsDermal bloodvessels constrictand sweat glandsremain inactive.

EffectorsDermal bloodvessels constrictand sweat glandsremain inactive.

ResponseBody heat is conserved,temperature rises toward normal.

StimulusBody temperaturedrops below normal.

ReceptorsThermoreceptorssend signals to thecontrol center.

ReceptorsThermoreceptorssend signals to thecontrol center.

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• Heat is a product of cellular metabolism• The most active body cells are the heat producers and include:

• Skeletal muscle• Cardiac muscle• Cells of certain glands such as the liver

• The primary means of heat loss is radiation• Also there is conduction, convection and evaporation

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• Hyperthermia – abnormally high body temperature

• Hypothermia – abnormally low body temperature

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Elevated Body Temperature

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• Inflammation is a normal response to injury or stress.• Blood vessels in affected tissues dilate and become more permeable, allowing fluids to leak into the damaged tissues.• Inflammed skin may become:

• Reddened• Swollen• Warm• Painful

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(a) (b)

(f) (g)

(c) (d) (e)

Scartissue

Fibroblasts

Scartissue

Blood cells

Site of injury

Scab

Bloodclot

Scab

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• First degree burn – superficial, partial-thickness

• Second degree burn – deep, partial-thickness

• Third degree burn – full-thickness• Autograft• Homograft• Various skin substitutes

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Anteriortrunk18%

Posteriortrunk18%

Anterior upperextremities 9%

Posterior upperextremities 9%

Posterior lowerextremities 18%

Perineum 1%

Anterior andposterior upper

extremities18%

Anterior andposterior lower

extremities36%

100%

Anterior andposterior trunk

36%

Anterior and posterior head and neck9%

Anterior headand neck 41/2%

Posterior headand neck 41/2%

Anterior lowerextremities 18%

9% 9% 9% 9%

41/2%

41/2% 41/2% 41/2% 41/2%

41/2%

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• Skin becomes scaly• Age spots appear• Epidermis thins• Dermis becomes reduced• Loss of fat• Wrinkling• Sagging• Sebaceous glands secrete less oil

• Melanin production slows• Hair thins• Number of hair follicles decreases• Nail growth becomes impaired• Sensory receptors decline• Body temperature unable to be controlled• Diminished ability to activate Vitamin D

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Important Points in Chapter 6:Outcomes to be Assessed

6.1: Introduction

Define organ, and name the large organ of the integumentary system.

6.2: Skin and Its Tissues

List the general functions of the skin.

Describe the structure of the layers of skin.

Summarize the factors that determine skin color.

6.3: Accessory Structures of the Skin

Describe the accessory structures associated with the skin.

Explain the functions of each accessory structure of the skin.

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Important Points in Chapter 6:Outcomes to be Assessed

6.4: Regulation of Body Temperature

Explain how the skin helps regulate body temperature.

6.5: Healing of Wounds and Burns

Describe the events that are part of wound healing.

Distinguish among the types of burns, including a description of healing with each type.

6.6: Lifespan Changes

Summarize lifespan changes in the integumentary system.

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Quiz 6

Complete Quiz 6 now!

Read Chapter 7.