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Yr2 Control - Term 2 and 3 > Workbook - Skin > Flashcards

Flashcards in Workbook - Skin Deck (71)
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1

How many layers is skin composed of?

Two.

2

What is the outer layer of skin called?

Epidermis.

3

What is the underlying layer of connective tissue in skin called?

Dermis.

4

What is deep to the dermis?

Superficial fascia/hypodermis/subcutis.
-layer of loose connective tissue with variable amounts of fat

5

What are the layers of skin?

-Epidermis
-Dermis
(-Hypodermis)

6

What determines whether skin is defined as thin or thick?

The thickness of the epidermis.
-particularly the outer layer of epidermis

7

What is another difference between thick and thin skin (apart from the thickness of the epidermis)?

Thin skin has hair follicles, thick skin is glabrous (non-hairy).

8

Where is thick skin generally located in humans?

Areas with lots of abrasion.
-fingertips, palms, soles

9

What type of epithelium is the epidermis made up of?

Keratinised stratified squamous.

10

What are the main layers of thick skin? (5)

DEEP TO SUPERFICIAL:
-Stratum basale
-Stratum spinosum
-Stratum graulosum
-Stratum lucidum
-Stratum corneum

11

What is stratum basale responsible for?

Regeneration (repeated mitotic divisions).
-irregular

12

What is stratum spinosum composed of?

Keratinocytes connected by desmosomes.

13

What is stratum granulosum composed of?

Loose nuclei and cytoplasms >> masses of keratin.

14

What is stratum lucidum like, and where is it found?

Thin and transparent.
-in the palms and soles

15

What is stratum corneum composed of?

Sheets of keratin.
-contains most barrier functions

16

Which layers of thick skin are most prominent?

-Stratum spinosum
-Stratum granulosum.

17

Which layer of thick skin is absent in thin skin?

Stratum lucidum.

18

What are the 3 types of non-epithelial cells present in the epidermis?

-Melanocytes
-Langerhans cells
-Merkel cells

19

What are melanocytes?

The pigment cells of the skin.

20

Which non-epithelial cells in the epidermis play a role in immunology?

Langerhans cells.

21

Which non-epithelial cells in the epidermis act as mechanoreceptors?

Merkel cells.

22

What are the main types of skin cancer? (3)

-Basal cell carcinoma
-Squamous cell carcinoma
-Malignant melanoma

23

How do the different types of skin cancer vary?

Each derived from different layers of the epidermis.

24

What layer of the epidermis is basal cell carcinoma derived from?

Stratum basale.

25

What layers of the epidermis is squamous cell carcinoma derived from?

Upper layers (keratinocytes/granular).
-stratum spinosum and stratum granulosum

26

What layer of the epidermis is malignant melanoma derived from?

Stratum basale.
-melanocytes

27

Which type of skin cancer is the least common and most dangerous?

Malignant melanoma.
-metastasises quickly

28

What are warts?

Small benign growths caused by viral infection (HPV) of the skin/mucous membrane.
>> increase keratin production in the epidermis

29

What happens during development to a number of epidermis structures?

They grow downwards to invade the underlying dermis and hypodermis.

30

What do the down-growths of the epidermis form?

Sweat glands, sebaceous glands and hair follicles.