Chapter 5:The Integumentary System Flashcards Preview

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Flashcards in Chapter 5:The Integumentary System Deck (106)
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1

How many regions make up the skin?

3
1. Epidermis
2. Dermis
3. Hypodermis

2

What is the epidermis?

outermost superficial region of skin

3

What is the dermis?

the middle region of the skin

4

What is the hypodermis?

the deepest region of the skin

5

what is another name for the hypodermis?

superficial fascia

6

what is superficial fascia?

the hypodermis

7

What is the epidermis comprised of?

keratinized stratified squamous epithelium, with 4 cell types and 4 to 5 layers

8

What cell types are found int the epidermis?

keratinocytes
melanocytes
Merkel cells
Langerhans' cells

9

What is the function of the epidermis?

it is the outer portion of the skin, is exposed to the external environment and functions in protection

10

Keratinocytes

– produce the fibrous protein keratin.

11

Melanocytes

– produce the brown pigment melanin.

12

Langerhans' cells

epidermal macrophages that help activate the immune system.

13

Merkel cells

function as touch receptors in association with sensory nerve endings.

14

What are the layers of the epidermis?

Stratum corneum
Stratum Lucidum
Stratum granulosum
Stratum spinosum
Stratum basale

15

What is the stratum basale?

the basal layer of the epidermis. the deepest layer, firmly attached to the dermis

16

What is the stratum basale made of?

a single row of the youngest keratinocytes

17

what happens in the stratum basale?

cells undergo rapid division, hence its alternate name, stratum germinativum

18

What is the stratum spinosum?

the prickly layer of the epidermis. 2nd from the bottom

19

What is the stratum spinosum made of?

1. cells contain weblike system of intermediate filaments attached to desmosomes.
2. melanin granules and Langerhans' cells are abundant in this layer

20

What is the stratum granulosum?

the granular layer, 2nd from the top

21

what does the stratum granulosum look like?

thin; three to five cell layers in which drastic changes in keratinocyte appearance occurs

22

What accumulates in the stratum granulosum?

Keratohyaline and lamellated granules

23

What is the stratum lucidum?

a clear layer, found only in thick skin. superficial to the stratum granulosum

24

What is the stratum lucidum made of?

a few rows of flat, dead keratinocytes

25

What is the stratum corneum?

the horny layer, the outermost layer

26

What percent of the epidermis is made of the stratum corneum?

3/4

27

What are the functions of the stratum corneum?

1. waterproofing
2. Protection from abrasion and penetration
3. Rendering the body relatively insensitive to biological, chemical, and physical assaults

28

What is the dermis?

the second major skin region containing strong, flexible connective tissue

29

What cell types are in the dermis?

fibroblasts, macrophages, and occasionally mast cells and white blood cells

30

What is the dermis composed of?

2 layers - papillary and reitcular