The Integumentary System

1
The Integumentary System

• Chapter 5

2
Introduction

• The integumentary system consists of hair, skin,
  and nails.
• Skin accounts for approximately 7 of total body
  weight (9-11 lbs) and varies in thickness (1.5 mm
  to 4.0 mm).
• Skin is composed of two distinct regions.

3
LAYERS OF SKIN
4
SKIN FUNCTIONS

• Protection
• Body temperature regulation
• Cutaneous sensation
• Metabolic functions
• Blood reservoir
• Excretion of wastes

5
EPIDERMIS

• Cell Types
• Keratinocytes
• Melanocytes
• Langerhans cells
• Merkel cells

6
EPIDERMIS

• Layers
• Stratum basale
• Stratum spinosum
• Stratum granulosum
• Stratum lucidum
• Stratum corneum

7
DERMIS

• Underlies the epidermis
• Composed of two layers
• Papillary layer areolar loose connective tissue
• Reticular layer dense irregular connective
  tissue (80)
• Contains many nerve endings

8
DERMIS
9
Review Question

• What is the name of the inner-most layer of the
  epidermis?
• a. Hypodermis
• b. Stratum basale
• c. Stratum corneum
• d. Dermis
• e. Stratum lucidum

10
Review Question

• Which layer of the dermis contains dense regular
  connective tissue?
• a. Hypodermis
• b. Papillary layer
• c. Reticular layer
• d. Stratum spinosum
• e. Stratum granulosum

11
SKIN PIGMENTATION

• Melanin
• Carotene
• Hemoglobin

12
ACCESSORY OGRANS

• Sweat glands
• Eccrine
• Apocrine
• Ceruminous
• Mammary
• Sebaceous glands

13
ACCESSORY ORGANS
14
ACCESSORY ORGANS
15
Review Question

• Which of the following refers to a modified
  sweat gland found in the external auditory meatus
  where it produces wax?
• a. Apocrine gland
• b. Eccrine gland
• c. Sebaceous gland
• d. Ceruminous gland
• e. Mammary gland

16
Review Question

• Which of the following terms refers to the
  cuticle of the nail?
• a. Eponychium
• b. Hyponychium
• c. Lunula
• d. Matrix
• e. Root

17
SKIN DISORDERS

• Skin cancer

18
SKIN CANCERS
Skin Cancer Video
19
SKIN DISORDERS

• Skin cancer
• Burns

20
SKIN DISORDERS
21
Rule of Nines
22
SKIN DISORDERS

• Skin cancer
• Burns
• Rosacea

23
ROSACEA
24
SKIN DISORDERS

• Skin cancer
• Burns
• Rosacea
• Dermatitis
• Contact dermatitis
• Acne
• Jaundice

• Seborrhea
• Hirsutism
• Alopecia
• Impetigo
• Psoriasis
• Albinism
• Striae