Transcript 05-02_pptlect.ppt

Anatomy & Physiology
SIXTH EDITION
Chapter 5, part 2
The Tissue Level of
Organization
PowerPoint® Lecture Slide Presentation prepared by
Dr. Kathleen A. Ireland, Biology Instructor, Seabury Hall, Maui, Hawaii
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Frederic H. Martini
Fundamentals of
SECTION 5-4
The Subcutaneous Layer
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Hypodermis
• Stabilizes skins position against underlying
organs and tissues
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SECTION 5-5
Accessory Structures
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Hairs
• Originate in hair follicle
• Composed of root and shaft
• Root base (hair papilla) surrounded by hair bulb
and root hair plexus
• Hairs have soft medulla and hard cortex
• Cuticle = superficial dead protective layer
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Figure 5.9 the Anatomy of a Single Hair
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Figure 5.9
Hair types
• Vellus hairs (peach fuzz)
• Terminal hairs ( heavy)
• Club hair (cessation of growth)
• Shed and grow according to hair growth cycle
Arrector pili muscle attaches to hair
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Figure 5.10 Hair Follicles
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Figure 5.10a-c
Glands in the skin
• Sebaceous
• Suderiferous
• Mammary
• Ceruminous
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Sebaceous glands
• Discharge waxy sebum onto hair shaft when
associated with hairs
• Sebaceous follicles discharge onto epidermal
surface
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Figure 5.11 Sebaceous Glands and Follicles
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Figure 5.11
Suderiferous glands
• Apocrine sweat glands
• Produce odorous secretion
• Merocrine (eccrine) sweat gland
• Sensible perspiration
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Figure 5.12 Sweat Glands
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Figure 5.12a, b
Other glands
• Mammary glands
• Structurally similar to apocrine sweat glands
• Ceruminous glands
• In ear, produce waxy cerumen
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Nails
• Nail body covers the nail bed
• Nail production occurs at the nail root
• Eponychium (cuticle) overlies root
• Free edge of nail extends over hyponychium
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Figure 5.13 The Structure of a Nail
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Figure 5.13
SECTION 5-7
Local Control of Integumentary Function
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Injury and repair
• Regenerates easily
• Regeneration process includes formation of
• Scab
• Granulation tissue
• Scar tissue
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Figure 5.14 Integumentary Repair
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Figure 5.14, step 1-2
Figure 5.14 Integumentary Repair
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Figure 5.14, step 3-4
SECTION 5-7
Aging and the Integumentary System
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With age
• Integument thins
• Blood flow decreases
• Cellular activity decreases
• Repairs occur more slowly
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You should now be familiar with:
• The components of the integumentary system,
including their physical relationships.
• The functions of the integumentary system.
• The main features and functions of the epidermis
and dermis.
• Individual and racial differences in skin.
• The effects of UV light on the epidermis.
• The structure and function of the various
accessory organs of the skin.
• How the skin responds to aging.
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