Lecture 9 - Integument Physiology II Flashcards
Which layer of skin is the thinnest
epidermis
which layer of skin has a thickness that depends on its location in the body
hypodermis
what is the largest population of cells within the epidermis
keratinocytes
order the layers of the epidermis (outer to inner)
stratum granulosum
stratum basale
stratum corneum
stratum spinosum
stratum basale
stratum spinosum
stratum granulosum
stratum corneum
What is the makeup of the stratum basale
mostly keratinocytes - anchor to the dermis, proliferative
what is the makeup of the stratum spinosum
nucleated daughter cells seemingly connected by intracellular bridges (webs)
keratinocytes of the SS synthesize:
a. lamellar granules
b. free sterols
c. glycoproteins
d. all of the above
d. all of the above
What cell layer becomes thickened during viral disease
stratum granulosum
what is the makeup of the stratum granulosum
shrunken nuclei, “granules” in cytoplasm
What is loricrin
an insoluble product of the SG that binds keratin filaments (think brick in the brick-and-mortar model)
what is the makeup of the stratum corneum
anuclear cells, large population of corneocytes
corneocyte
differentiated cell containing cornified envelope (structural support and defense against environmental agents)
on average, how many days does it take for the epidermis to turn over
20-25 days
Come Get Sun Burnt
Corneum, Granulosum, Spinosum, Basale
adnexa
structures found in the dermis
simple follicle
single hair emerges from the follicle
compound follicle
multiple hairs emerge from the shared follicle
what species have simple follicles? compound?
s - horses, pigs, cattle
c - cats, dogs, small ruminants
primary hair
guard hair
secondary hair
undercoat
Infundibulum
superficial most
Isthmus
middle part of follicle; arrector pilli attachment
inferior
deepest part; contains hair bulb
match the animal to its sebaceous gland
a. horse
b. sheep
c. goats
d. dogs
e. cats
- supracaudal
- preputial
- corneal
- infraorbital, inguinal, interdigital
- submental
horse = preputial
sheep = infraorbital, inguinal, interdigital
goat = corneal
dog = supracaudal
cat = submental
apocrine is found with ______ while ecchrine is found with ______
hair follicle; no follicle
what is the difference between apocrine and eccrine glands and its surrounding cells
apocrine is species reliant whereas eccrine is cuboidal
anagen
growth
catagen
regression
telogen
rest
exogen
shedding
cataegen is known as the _____ phase between _____ and ______
transitional; anagen; telogen
Which factor does NOT contribute to the hair cycle?
a. nutrition
b. hormones
c. photoperiod
d. skin color
e. ambient temp
d. skin color
