3
Membranes and the
Integumentary System
Lesson 3.1: Body Membranes
Lesson 3.2: The Integumentary System
Lesson 3.3: Injuries and Disorders of
the Skin
Membranes and the Integumentary System
Lesson 3.1
Body Membranes
Body Membranes
• epithelial membranes
– mucous membranes
– serous membranes
– cutaneous membranes
• connective tissue membranes
– synovial membranes
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Epithelial Membranes
• mucous membranes
– line cavities open to the environment
• serous membranes
– line cavities not open to environment: peritoneum
lines the abdominal cavity
– surrounds organs: pleura surrounds the lungs, and
pericardium surrounds the heart
• cutaneous membranes
– form what we know as skin
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Mucous Membranes and Serous
Membranes
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Connective Tissue Membranes
• synovial membrane
– capsule around synovial joint
– tendon sheath
– synovial fluid
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Review and Assessment
Match these words with 1–4 below: synovial,
mucous, cutaneous, serous.
1. line cavities open to the environment
2. line cavities not open to the environment
3. tendon sheath
4. form skin
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Chapter 3: Membranes and the Integumentary System
Lesson 3.2
The Integumentary
System
The Integumentary System
• functions of the integumentary system
• anatomy of the skin
• appendages of the skin
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Functions of the Integumentary System
• protects against
–
–
–
–
abrasion
chemical damage
drying out
UV radiation damage
• regulates body temperature
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Functions of the Integumentary System
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Anatomy of the Skin
• epidermis
• dermis
• hypodermis
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Layers of the Epidermis
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Review and Assessment
True or False?
1. The dermis is the superficial layer of the skin.
2. The skin helps regulate body temperature.
3. The epidermis has three layers.
4. The hypodermis is above the dermis.
5. The skin protects against UV radiation.
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Epidermal Cells
• keratinocytes
– produce keratin, form layers of epidermis
• epidermal dendritic cells
– ward off infections
• Merkel cells
– touch receptors
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Dermis
• dense, fibrous connective tissue
• papillary layer
– forms fingerprints
• reticular layer
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Hypodermis
• fibrous connective tissue
• adipose tissue
– padding
– insulation
– energy storage
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Appendages of the Skin
• sudoriferous (sweat) glands
– eccrine
– apocrine
• sebaceous glands
• hair
• nails
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Review and Assessment
Fill in the blanks with: hypodermis, keratinocytes,
sweat, or papillary.
1. Eccrine is a type of _______________ gland.
2. _______________ produce keratin.
3. Adipose tissue is found in the _______________.
4. The _______________ of the dermis forms
fingerprints.
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Chapter 3: Membranes and the Integumentary System
Lesson 3.3
Injuries and Disorders
of the Skin
Injuries and Disorders of the Skin
• injuries of the skin
• infections of the skin and membranes
• inflammatory conditions of the skin and
membranes
• cancers of the skin
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Injuries of the Skin
• decubitus ulcers
– bedsores
– caused by restricted blood supply
• burns
– first-, second- or third-degree
– caused by heat, chemicals, electricity or UV radiation
– rule of nines
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Infections of the Skin and Membranes
• viral infections
– herpes varicella
– herpes zoster
– herpes simplex virus
type 1 or type 2
– human papillomavirus
• warts
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Infections of the Skin and Membranes
• fungal infections
–
–
–
–
athlete’s foot
jock itch
ringworm
toenail fungus
• bacterial infections
– impetigo
– cellulitis
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Inflammatory Conditions of the Skin
and Membranes
• pleurisy
– makes smooth surface
of pleura rough
• peritonitis
– infection of peritoneum
• psoriasis
– involves redness and
irritation
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Cancers of the Skin
• basal cell carcinoma
• squamous cell carcinoma
• malignant melanoma
– ABCD rule
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Review and Assessment
True or False?
1. Herpes zoster causes decubitus ulcers.
2. Peritonitis is an infection of the skin.
3. Impetigo is caused by a fungus.
4. Warts are caused by a virus.
5. Ringworm is caused by a fungus.
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