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Flashcards in Integument Deck (41):
1

Three categories of hair

1. Primary or Guard hairs

2. Secondary or Wool Hairs

3. Tactile or Sinus Hairs

1

The three layers of skin

1. Epidermis

2. Dermis

3. Hypodermis

2

Two types of sweat glands and the difference between them

1. Eccrine Gland - Empties onto the surface

2. Apocrine Gland - Empties into a hair follicle

3

Where are sebaceous glands not found?

paw pads and planum nasale

4

Principal cells found in the Epidermis

Keratinocytes, Melanocytes, Merkel, and Langerhans cells 

5

The 4 types of tissue

Epithelial tissue, connective tissue, muscle tissue, and nervous tissue

7

The part of the hair that is visible above the skin is called the ________, and the portion of the buried within the skin is called the _______.

Shaft & Root

8

Name the layers of the epidermis from deepest to superficial

Stratum Basale, Stratum Granulosum, Stratum Lucidum, Stratum Lucidum

9

What is pruritus

Itchiness

10


What are 6 functions of skin?


1.Protect, cover and line.
2.Filter biochemical substances.
3.Absorb nutrients
4.Provide sensory input
5.Manufacture secretions
6.Manufacture excretions

11

Made of 4-5 layers

Epidermis

12

Only found in thick skin

Stratum Lucidium

13

Cells give up vital organelles and nuclei to make room for Which tough, protective substance.

keratin

14

At the epidermal-dermal junction which cells found in small numbers are always associated with a sensory nerve

Merkel Cells

15


What layer lies just beneath the epithelial layer of the epidermis and is composed of loose conective tissue with loosely woven fibers and ground substance.

Papillary layer

16

Where can simple epithelium be found?

Protected areas: internal compartments, ducts, vessels, and passageways.

17

Where can stratified squamous epithelium be found?

Areas where cells must reproduce rapidly: vagina, mouth, anus.

18

What is the top of a dog's nose also known as?

Planum nasale

19

What are the 3 types of cellular junctions found between epithelial cells?

1.Tight junction

2.Desmosomes

3. Gap Junctions

20

Name 4 glands of the skin

1.Sebaceous glands

2.Sweat glands

3.Tail Glands

4.Anal Sacs

21


What type of muscle is the arrector pili muscle?

Smooth muscle

22


What are tail glands thought to assist with?


Recognition and identification of other animals

23


What glands are found in the external ear canal of dogs?

Apocrine sweat glands

24


what are the 3 layers of hair

outer layer- cuticle

middle layer - cortex

intermost layer - medulla

25

what muscle makes the hair stand up

arrector pilli muscle

26

what kind of muscle is the arrector pilli

smooth muscle

27

The skin is responsible for the production of which vitamin?

Vitamin D

28

Which gland produces sebum?

Sebaceous

29

What 2 layers is the dermis composed of ?

Papillary and Reticular

30

Why does hair turn grey or white as animals age?

Melanin production decreases. The cortex loses its pigment entirely and the medulla becomes filled with air.

31

The period of transition between the anagen and telogen phase is called?

The catagen phase

32

What causes pigmentation of skin?

The presence or absence of melanin granules in the armlike extensions in the melanocytes.

33

What waterproofs the skin and gives it strength?

Keratinocytes

34

Where are keratinocytes found? 

Stratum Basale

35

Superficial layer of the epidermis

Stratum Corneum

36

Composed of areolar tissue containing adipose, blood and lymphatic vessels, and nerves

Hypodermis

37

What cells are produced in the bone marrow?

Langerhans Cells

38

What cell is associated with sensory nerve endings?

Merkel Cells

39

Name the principle cells found in the Epidermis?

Keratinocytes, Melanocytes, Merkel cells, and Langerhans cells.

40

Where is the pacinian corpuscle located?

The hypodermis

41

What protects the keratinocytes from UV radiation?

Melanin