Integumentary System University

By R Marsh, Ph.D.

Integumentary System

Integumentary System

Integumentary System

​Function:

• Protect the inside of the body from elements in the environment

  • ​Examples: bacteria, pollution, and UV

• Retain bodily fluids

• Eliminate waste products

• Regulate the body temperature​

​

Integumentary System

Integumentary System

​Structures:

• Skin

• ​Hair

• ​Nail

• ​Exocrine Glands

  • ​sudoriferous glands (sweat glands)

  • ​Sebaceous Glands

  • ​Ceruminous Glands

  • ​Mammary Gland

SKIN: Epidermis

• Most superficial layer of the skin

• Protects the deeper and thicker dermis layer of the skin

• ​about 4- to 50 rows of stacked squamous epithelial cells

• ​An avascular region (does not contain blood or blood vessels

SKIN:Epidermis

​Layers

• Stratum Corneum

• ​Stratum Lucidum

• ​Stratum Granulosum

• ​Stratum Spinosum

• ​Stratum Basale

SKIN:Epidermis

​Cell Types

• Keratinocytes: (90%) of epidermal cells contains keratin, protects and waterproofs the skin

• Melanocytes: (8%) produces melanin, skin color and absorbs UV light

• ​Langerhans: (1%) Participate in immune response

• ​Merkel Cells: (.5%) sensation of touch

SKIN:Dermis

​Layers (connective tissue)

• Papillary Layer

  • ​contain nerves and blood vessels

• ​Reticular Layer

  • ​tough collagen and stretchy elastin fibers running in all direction to provide strength and elasticity

  • ​contains blood vessels

SKIN:

Below the Dermis: HYPODERMIS

• Below the Dermis:

  • ​Loose connective tissues called hypodermis subcutis

  • ​Serves as the flexible connection between the skin and the underlying (muscles, bones, fat..)

Multiple Choice

The top layer of the skin is called the _________________.

• dermis
• oil gland
• nerve
• epidermis

Multiple Choice

The coloring in the skin; found in the epidermis.

• Melanin
• Oil
• Perspiration
• Pores

Multiple Choice

The waterproofing protein that fills the cells in the upper layers of the epidermis.

• Keratin
• Melatonin
• Melanin
• Actin

Multiple Choice

The vasculated area of skin is the:

• Dermis
• Epidermis
• Hypodermis
• Stratum basale

Multiple Select

What are the 4 parts of the Integumentary System?

• Skin

• Hair

• Heart

• Nails

• Sweat Glands

Multiple Choice

The epidermis is composed of what kind of cells?

• Simple squamous epithelial

• Stratified cuboidal epithelial

• Stratified squamous epithelial

• Transitional epithelial

Multiple Choice

What types of cells found in the epidermis contain nerve endings that are touch receptors?

• Keratinocytes

• Langerhans cells

• Melanocytes

• Merkel cells