Lecture 9 - Integument Physiology II

Question 1

Which layer of skin is the thinnest

Answer 1

epidermis

Question 2

which layer of skin has a thickness that depends on its location in the body

Answer 2

hypodermis

Question 3

what is the largest population of cells within the epidermis

Answer 3

keratinocytes

Question 4

order the layers of the epidermis (outer to inner)

stratum granulosum
stratum basale
stratum corneum
stratum spinosum

Answer 4

stratum basale
stratum spinosum
stratum granulosum
stratum corneum

Question 5

What is the makeup of the stratum basale

Answer 5

mostly keratinocytes - anchor to the dermis, proliferative

Question 6

what is the makeup of the stratum spinosum

Answer 6

nucleated daughter cells seemingly connected by intracellular bridges (webs)

Question 7

keratinocytes of the SS synthesize:

a. lamellar granules
b. free sterols
c. glycoproteins
d. all of the above

Answer 7

d. all of the above

Question 8

What cell layer becomes thickened during viral disease

Answer 8

stratum granulosum

Question 9

what is the makeup of the stratum granulosum

Answer 9

shrunken nuclei, “granules” in cytoplasm

Question 10

What is loricrin

Answer 10

an insoluble product of the SG that binds keratin filaments (think brick in the brick-and-mortar model)

Question 11

what is the makeup of the stratum corneum

Answer 11

anuclear cells, large population of corneocytes

Question 12

corneocyte

Answer 12

differentiated cell containing cornified envelope (structural support and defense against environmental agents)

Question 13

on average, how many days does it take for the epidermis to turn over

Answer 13

20-25 days

Question 14

Come Get Sun Burnt

Answer 14

Corneum, Granulosum, Spinosum, Basale

Question 15

adnexa

Answer 15

structures found in the dermis

Question 16

simple follicle

Answer 16

single hair emerges from the follicle

Question 17

compound follicle

Answer 17

multiple hairs emerge from the shared follicle

Question 18

what species have simple follicles? compound?

Answer 18

s - horses, pigs, cattle

c - cats, dogs, small ruminants

Question 19

primary hair

Answer 19

guard hair

Question 20

secondary hair

Answer 20

undercoat

Question 21

Infundibulum

Answer 21

superficial most

Question 22

Isthmus

Answer 22

middle part of follicle; arrector pilli attachment

Question 23

inferior

Answer 23

deepest part; contains hair bulb

Question 24

match the animal to its sebaceous gland

a. horse
b. sheep
c. goats
d. dogs
e. cats

1. supracaudal
2. preputial
3. corneal
4. infraorbital, inguinal, interdigital
5. submental

Answer 24

horse = preputial
sheep = infraorbital, inguinal, interdigital
goat = corneal
dog = supracaudal
cat = submental

Question 25

apocrine is found with ______ while ecchrine is found with ______

Answer 25

hair follicle; no follicle

Question 26

what is the difference between apocrine and eccrine glands and its surrounding cells

Answer 26

apocrine is species reliant whereas eccrine is cuboidal

Question 27

anagen

Answer 27

growth

Question 28

catagen

Answer 28

regression

Question 29

telogen

Answer 29

rest

Question 30

exogen

Answer 30

shedding

Question 31

cataegen is known as the _____ phase between _____ and ______

Answer 31

transitional; anagen; telogen

Question 32

Which factor does NOT contribute to the hair cycle?

a. nutrition
b. hormones
c. photoperiod
d. skin color
e. ambient temp

Answer 32

d. skin color