Lecture 9 - Integument Physiology II Flashcards

1
Q

Which layer of skin is the thinnest

A

epidermis

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2
Q

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

A

hypodermis

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3
Q

what is the largest population of cells within the epidermis

A

keratinocytes

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4
Q

order the layers of the epidermis (outer to inner)

stratum granulosum
stratum basale
stratum corneum
stratum spinosum

A

stratum basale
stratum spinosum
stratum granulosum
stratum corneum

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5
Q

What is the makeup of the stratum basale

A

mostly keratinocytes - anchor to the dermis, proliferative

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6
Q

what is the makeup of the stratum spinosum

A

nucleated daughter cells seemingly connected by intracellular bridges (webs)

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7
Q

keratinocytes of the SS synthesize:

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

A

d. all of the above

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8
Q

What cell layer becomes thickened during viral disease

A

stratum granulosum

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9
Q

what is the makeup of the stratum granulosum

A

shrunken nuclei, “granules” in cytoplasm

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10
Q

What is loricrin

A

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

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11
Q

what is the makeup of the stratum corneum

A

anuclear cells, large population of corneocytes

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12
Q

corneocyte

A

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

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13
Q

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

A

20-25 days

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14
Q

Come Get Sun Burnt

A

Corneum, Granulosum, Spinosum, Basale

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15
Q

adnexa

A

structures found in the dermis

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16
Q

simple follicle

A

single hair emerges from the follicle

17
Q

compound follicle

A

multiple hairs emerge from the shared follicle

18
Q

what species have simple follicles? compound?

A

s - horses, pigs, cattle

c - cats, dogs, small ruminants

19
Q

primary hair

A

guard hair

20
Q

secondary hair

21
Q

Infundibulum

A

superficial most

22
Q

Isthmus

A

middle part of follicle; arrector pilli attachment

23
Q

inferior

A

deepest part; contains hair bulb

24
Q

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
A

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

25
apocrine is found with ______ while ecchrine is found with ______
hair follicle; no follicle
26
what is the difference between apocrine and eccrine glands and its surrounding cells
apocrine is species reliant whereas eccrine is cuboidal
27
anagen
growth
28
catagen
regression
29
telogen
rest
30
exogen
shedding
31
cataegen is known as the _____ phase between _____ and ______
transitional; anagen; telogen
32
Which factor does NOT contribute to the hair cycle? a. nutrition b. hormones c. photoperiod d. skin color e. ambient temp
d. skin color