A&P - Chapter 10 (Part 2)

Question 1

What are 3 differences of the dermis compared to the epidermis?

Answer 1

The dermis is…

1. Deeper
2. Thicker
3. Cells are scattered farther apart

Question 2

What is the dermis largely composed of?

Answer 2

Connective tissue

Question 3

What does the connective tissue give the dermis?

Answer 3

Its strength

Question 4

What goes in between the scattered cells of the dermis?

Answer 4

Fibres

- collagen and elastic

Question 5

What does the dermis contain? (6)

Answer 5

1. Nerve endings
2. Muscle fibres
3. Hair follicles
4. Sweat glands
5. Subaceous glands
6. Rich vascular supply

Question 6

What critical role does the dermis play?

Answer 6

Temperature regulation

Question 7

What are the 2 distinct layers of the dermis?

Answer 7

1. Papillary layer
   - superficial
2. Reticular layer
   - deeper

Question 8

What is the orientation of the papillary layer?

Answer 8

Parallel rows of dermal papillae

- finger like (more surface to connect)

Question 9

What does the papillary layer help do?

Answer 9

Helps bind dermis to epidermis

Question 10

What is papillary layer the basis of?

Answer 10

Fingerprinting

Question 11

What does the papillary layer allows us to do?

Answer 11

Improve our grip

Question 12

What is the orientation of the reticular layer?

Answer 12

Network of collagenous and stretchable fibres

Question 13

What happens to elastic fibres as we increase in age?

Answer 13

We get more wrinkles

Question 14

What is the reticular layer responsible for?

Answer 14

Keeping your skin looking young

Question 15

Does the dermis shed?

Answer 15

No

Question 16

What happens in the dermis during healing?

Answer 16

Fibroblasts begin forming an usually dense mass of new connective tissues
- if not replaced by normal tissue it will scar

Question 17

Cleavage lines

Answer 17

Are patterns formed by the collagenous fibres of the reticular layer of the dermis

Question 18

What do cleavage lines play a role in? (2)

Answer 18

1. Incision healing

2. Stretch marks

Question 19

What are 2 other names for the hypodermis?

Answer 19

1. Subcutaneous layer

2. Superficial fascia

Question 20

Where is the hypodermis located?

Answer 20

Under the dermis

Question 21

What is the hypodermis made up of?

Answer 21

Loose connective tissue

Question 22

What does the hypodermis form?

Answer 22

A connection between the skin and other structures

Question 23

What is the hypodermis primarily made up of?

Answer 23

Fat

Question 24

What are 3 things the fat from the hypodermis do?

Answer 24

1. Insulation from extreme heat
2. Alternative source of energy
3. Protective cushion

Question 25

What does skin pigment do?

Answer 25

Gives the skin its colour

Question 26

Where is skin pigment produced?

Answer 26

In the stratum basale/germinativum

Question 27

What cell produces the skin pigment?

Answer 27

Melanocytes

Question 28

What is pigment called?

Answer 28

Melanin

Question 29

What is the primary function of melanin?

Answer 29

Is to absorb harmful UV radiation from sunlight to prevent sunburn

Question 30

Albinism

Answer 30

No melanin

- white

Question 31

What are albinism at high risk for?

Answer 31

Skin cancer

- because there is no protection against the sun