The Integumentary System Is Composed of
Skin, Glands, Hair, Nails, and Nerve Endings
LEARNING OBJECTIVES
1.
Identify
various parts of the integumentary
system.
2.
Describe
the structure of the skin.
3.
Explain
the basis for skin colors.
our skin is the most visible organ of your body.
Its appearance and health is affected by nu-
trition, hygiene, blood circulation, age, immu-
nity, genetics, psychological state, and drugs.
Because the appearance of the skin contributes so much to
a person’s self-image, people spend vast amounts of mon-
ey and time on hygiene, beauty products, and medical
treatments to take care of it. The branch of medicine
that specializes in diagnosing and treating skin disor-
ders is called dermatology (
der-ma-TOL-o-je
;
dermato-
= skin;
-logy =
study of ). Let’s take a closer look at skin
and the other structures that make up the integumen-
tary system.
There Are Many Components
of the Integumentary System
The integumentary system (
in-teg'-u-MEN-tar-e
;
in- =
in-
ward;
tegere =
to cover) is composed of the skin, hair, oil
and sweat glands, nails, and sensory receptors (Figure 4.1).
InSight
T h e in te g u m e n ta ry syste m
Figure 4.1
The integumentary system is composed of the skin,
hair, oil and sweat glands, nails, and sensory receptors.
Epidermal ridge
Dermal
papilla
Sweat pore
Capillary
loop
a. Skin
S ^ T T
• Two layers: Epidermis,
(oi) g an
dermis.
Meissner
• Epidermis: Five
layers of
corpuscle
various cell types.
• Dermis: Mainly
connective tissue and
elastic fibers.
• Three pigments provide
color.
• Contains accessory
glands that secrete oil
and sweat, nerve
endings, and blood
vessels.
• Protects the body,
regulates body
temperature, detects
cutaneous sensations,
makes vitamin D, and
excretes and absorbs
various substances.
Hair shaft
Free nerve
ending
- EPIDERMIS
-
.
Papillary
region
Arrector
pili muscle
Hair follicle
Hair root
Eccrine
sweat gland
Apocrine
sweat gland
Lamellated (pacinian)
corpuscle
Sensory nerve
Adipose tissue
- DERMIS
Reticular
region
— Subcutaneous
layer
Blood vessels:
Vein
Artery
Müls
92 CHAPTER 4
The Integumentary System
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