The integumentary system

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Ch. 6 Study Guide

Critically read Chapter 6–
pp. 187-194 before

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§ Quotable Quotes (Skin)

Some guys say beauty is only skin deep.

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I. Introduction

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§ Overview (1)

Dermatology– scientific study and medical treatment of this system
Largest

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§ Overview (2)

Thickness variable, based on thickness of Epidermis, two categories--
Thick

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§ Functions of the Skin

Resistance to trauma/infection
Why? (Fig. 5.28)
acid mantle (pH

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In hot environment

In cold environment

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vasodilation

vasoconstriction

Heat loss

Less
Heat loss

Thermoregulation

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Social functions-- Figure 6.2

Skeletal muscles attach to dermal collagen fibers and

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II. Epidermis

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§ Cells of the Epidermis (1)

Five types of cells--
Keratinocytes – most

The Epidermis— Fig. 6.2

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§ Cells of the Epidermis (2)

Location of the following types of

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Melanocyte

Keratinocytes

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§ Layers of the Epidermis— Next five slides (1-5) from deep to superficial

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1. Stratum Basale (deepest layer)

Single layer cells on basement membrane (Fig.

Figure 6.2a

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2. Stratum Spinosum– above stratum basale

Several layers of keratinocytes (flattened as

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3. Stratum Granulosum

3 to 5 layers flat keratinocytes: three developments occur

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4. Stratum Lucidum— superficial to the stratum granulosum

Thin translucent zone seen

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5. Stratum Corneum

Up to 30 layers of dead, scaly, keratinized cells
surface cells

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§ Life History of Keratinocytes

Produced by stem cells in stratum basale
New

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Fig. 6.4 The House Dust Mite, Dermatophagoides

They are about 0.5 mm

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Questions (muddiest points)? Next section– III. Dermis & Hypodermis

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§ Dermis- a C.T. layer

Thickness = 0.2 to 4.0 mm
Composition
Collagen (mainly),

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Fig. 6.5 layers of the dermis

Dermal papillae

Epidermal ridges

Areolar Tissue

Dense irregular CT

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§ Hypodermis

Other names--Subcutaneous tissue; superficial fascia
Mostly adipose tissue; Uniformly distributed?; 8%

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Questions? Next section— IV. Cutaneous Glands

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Table 6.2— summary of cutaneous glands 1. Sweat glands 2. Oil glands 3. Ceruminous

§ Cutaneous Glands

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1. Two kinds of Sweat Glands

Filtrate of plasma and some waste

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2. Sebaceous (Oil) Glands

Oily secretion called sebum that contains broken-down cells
Due

ID specific cutaneous glands (A & B).

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A.

B.

Which specific kind?

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3. Ceruminous Glands

Found only in external ear canal
Their secretion combines with

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Ceruminous glands—inappropriate interventions

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? Cotton-tipped applicator (a no-no)

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ᵡ Ear Candling!?

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4. Mammary Glands

Breasts of both sexes rarely contain mammary glands
secondary sexual

Mammary Glands

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Areola

Nipple

Check Point Questions

(True/False) The three layers of the skin are the

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Questions (muddiest points)? Next section— V. Skin Disorders

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§ Skin Cancer

Cause– the ultraviolet rays of the sun
There is

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A. Basal cell carcinoma

Most common type and the least dangerous one
Origination-

Fig. 6.12a

A. Basal cell carcinoma

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B. Squamous cell carcinoma

Chance of recovery is good with early detection

B. Squamous cell carcinoma

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C. Malignant melanoma

Most deadly skin cancer but accounts for only 5%

C. Malignant melanoma; which of the ABCD rules can you identify

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