The Integumentary System Chapter 3: Membranes and the Integumentary System Lesson 3.2 The Integumentary System

The Integumentary System functions of the integumentary system anatomy of the skin appendages of the skin

Functions of the Integumentary System protects against abrasion chemical damage drying out UV radiation damage regulates body temperature

Functions of the Integumentary System

Anatomy of the Skin epidermis dermis hypodermis

Layers of the Epidermis

Epidermal Cells keratinocytes produce keratin, form layers of epidermis epidermal dendritic cells (Langerhans cells) ward off infections Merkel cells touch receptors Melanocytes produce melanin

Dermis dense irregular fibrous connective tissue papillary layer forms fingerprints reticular layer

Hypodermis fibrous connective tissue adipose tissue padding insulation energy storage

Appendages of the Skin sudoriferous (sweat) glands sebaceous glands eccrine apocrine sebaceous glands hair nails

Review Questions

The two layers of the dermis are the ______________ layer and the reticular layer.

The outermost layer of the epidermis is the _____________.

The ________________ layer of the epidermis contains melanocytes.

Beginning at the stratum basale and moving up the next layer of the epidermis is the ____. A. stratum spinosum B. stratum granulosum C. stratum lucidum D. stratum corneum

Which of the following produce a pigment that acts as sunscreen. A Which of the following produce a pigment that acts as sunscreen? A. Merkel cells B. epidermal dendritic cells C. keratinocytes D. melanocytes

The fingerprints are derived from patterns in the ____. A The fingerprints are derived from patterns in the ____. A. reticular layer B. papillary layer C. hypodermal layer D. melanin layer

The ____ is found only on the palms, soles, fingers and toes. A The ____ is found only on the palms, soles, fingers and toes. A. stratum corneum B. stratum lucidum C. stratum granulosum D. stratum basale

Merkel cells function as ____. A. sweat glands B Merkel cells function as ____. A. sweat glands B. infection preventers C. touch receptors D. sunscreen

Injuries and Disorders of the Skin Chapter 3: Membranes and the Integumentary System Lesson 3.3 Injuries and Disorders of the Skin

Injuries and Disorders of the Skin injuries of the skin infections of the skin and membranes inflammatory conditions of the skin and membranes cancers of the skin

Injuries of the Skin decubitus ulcers burns bedsores caused by restricted blood supply burns first-, second- or third-degree caused by heat, chemicals, electricity or UV radiation rule of nines Suzanne Tucker/Shutterstock.com, JTeffects/Shutterstock.com, Naiyyer/Shutterstock.com

Rule of Nines

Infections of the Skin and Membranes viral infections herpes varicella herpes zoster herpes simplex virus type 1 or type 2 human papillomavirus warts Maksym Bondarchuk/Shutterstock.com

Infections of the Skin and Membranes fungal infections (tinea) athlete’s foot jock itch ringworm toenail fungus bacterial infections impetigo cellulitis

Inflammatory Condition of the Skin psoriasis involves redness and irritation Kenxro/Shutterstock.com

Cancers of the Skin basal cell carcinoma squamous cell carcinoma malignant melanoma ABCD rule Librakv/Shutterstock.com