Anat & Phys Mod 2.pptx - Integumentary System Structure &...

Integumentary System
Structure & Function
Epidermis
Dermis
Integumentary Organs
Applications

Structure & Function
Anatomy and Physiology I

Objectives
11/06/2021
3
•
Label and explain the functions of the integumentary
system
•
Label the structures of the integumentary system

Integument: Overview
•
The skin is the largest organ in the body by weight
–
Roughly 15% of overall body weight
•
Integument refers to outer covering- for humans it is
the skin
•
If you included the accessory organs, referred to as
the integumentary system
–
Hair
–
Finger nails
–
Sensory receptors
–
Glands
11/06/2021
4

Integument: Overview
•
Epidermis
–
Epithelial tissue
•
Dermis
–
Connective tissue
–
Nervous tissue
–
Muscular tissue
•
Hypodermis
–
Technically not part of integument
•
Accessory Organs
–
Hair, nails, sensory receptors, and various cutaneous
glands
11/06/2021
5

Integument Anatomy
11/06/2021
6

Integument: Functions
•
Maintains homeostasis
•
Resistance to trauma, infection and other barriers
•
Regulates body temperature
•
Retards water loss
•
Houses sensory receptors
•
Helps in the synthesis vitamin D
•
Excretes small quantities of wastes
•
Nonverbal communication
11/06/2021
7

Epidermis
Anatomy and Physiology I

Objectives
11/06/2021
9
•
Compare and contrast the characteristics of the
epidermis and dermis
•
Explain how skin color can be influenced
•
Define the accessory organs of the skin and their
characteristics

Epidermis: Overview
•
Outer most layer of skin
•
Stratified keratinized squamous epithelium
•
Lacks blood vessels and nerves
•
Very thin layer
•
Bottom most layer is connected to basement
membrane
11/06/2021
10

Epidermis: Cells
•
Stem (Basal) cells
–
Undifferentiated cells in deepest layers
•
Keratinocytes
–
Majority of skin cells
–
Synthesis keratin
•
Melanocytes
–
Synthesize pigment melanin that protects against UV light
•
Tactile (Merkel) cells
–