AnatomyLesson 1 of 4 in the course The Integumentary System

Skin Structure, Pigmentation, and Clinically Relevant Color Changes

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

The epidermis is the outermost layer of the skin and forms an important protective barrier. This lesson explores its structure, the progression of its cells from deep to superficial, and the differences between thin and thick skin.

The epidermis is made of keratinized, stratified squamous epithelium. It is avascular, meaning it contains no blood vessels; nutrients reach its cells from tissues beneath it. Most areas have four epidermal layers and are called thin skin. The palms of the hands, soles of the feet, and digits have thick skin, which has five layers.

All flashcards

What is the epidermis?
The outermost skin layer, made of keratinized stratified squamous epithelium. It is avascular and forms a protective barrier.
What is a keratinocyte?
An epidermal cell that produces and stores keratin, a fibrous protein that helps make skin hard and water-resistant.
What is the order of epidermal layers from deep to superficial?
Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum in thick skin only, and stratum corneum.
How does thick skin differ from thin skin?
Thick skin, found especially on the palms and soles, has five epidermal layers, including the stratum lucidum. Thin skin has four and lacks this layer.
What are protective functions of the stratum corneum?
Its dead, keratinized cells limit water loss, help block microbes, and protect underlying tissue from abrasion.

Quiz questions

  1. What type of connective tissue makes up the dermal reticular layer?Answer: Dense irregular connective tissue.
  2. Which receptor in the papillary dermis detects touch?Answer: Meissner corpuscles.
  3. Which role is performed by adipose tissue in the hypodermis?Answer: Storing energy and cushioning underlying structures.
  4. Which cells produce melanin and package it into melanosomes?Answer: Melanocytes.
  5. What color is pheomelanin?Answer: Red.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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