Integument System

Integument system

Cutaneous membrane, skin derivatives, blood vessels, nerves

What are the functions of the Integument system?

Protection

Prevention

Metabolic Function

Immune defense

Sensory reception

Secretion

Social behavior

What does the integument system protect your from?

Physical Trauma and abrasions

Chemicals

Toxins

Pathogens

Solar radiation

What does the integument system prevent?

Water loss and gain

What are the sensory receptors of the integument system?

Temperature receptors

Touch and pressure receptors

Pain receptors

What does the integument system secrete?

Sweat

Oils

What is the metabolic function of the integument system?

Vitamin D synthesis through the skin

Vitamin D helps with calcium absorption

What is the immune defense of the integument system?

The immune defense of the integument system is epidermal dendritic cells. These cells phagocytize pathogens and eat epidermal cancer cells.

What are the gross layers of the integument system?

Epidermis

Dermis

Hypodermis

What are the microscopic layers of the integument system?

Stratum corneum (Cornified - dead and dry)

Stratum lucidum (Lucid - clear)

Stratum granulosum (Granule keratin)

Stratum spinosum (Stretched, getting spine like)

Stratum germinative/basale

Papillary layer - Loose areolar CT (Nipple, hair)

Reticular layer - Dense irregular CT

Describe the characteristics and functions of the Epidermis

Keratinized stratified squamous ET, protection.

Contains all the stratum layers

Describe the characteristics and functions of the Dermis

Areolar and dense irregular CT, toughness

Contains the papillary and reticular layers

Describe the characteristics and functions of Hypodermis

Subcutaneous, not actually part of the skin)

What are the skin derivatives?

Hair and nails

Describe the characteristics and functions of Hair

Extruded keratin strands that help with insulation, communication, thermoregulation and UV protection

They have arrector pili muscles that when reacting to temperature or emotional state cause hair to stand up.

Describe the characteristics and functions of Nails

Scale like modifications of the stratum corneum, protects the distal tips of digits