Ch 10 - Skin deep Flashcards
Where and what is the integumentary system?
where - on the outside what - skin
The skin is composed of what kind is of tissue?
epithelium tissue - does not contain blood vessels
What is epithelial tissue sometimes called?
epithelium
What are the combining forms for skin?
cutane/o, derm/o, and dermat/o
The suffix -derma means…?
Skin
What does Dermatology mean?
the study of the skin
The skin is made up of 3 levels, what are they?
The epidermis, dermis, subcutaneous layer
The prefix epi- means?
above
The epidermis is sometimes called?
vascular layer
The epidermis depends on the deepest layer for …?
nourishment
The thickest layers of the epidermis are found in the areas of greatest exposure such as…?
foot pads and teats
The epidermis is made up of what kind of cells?
squamous epithelium cells
What is the squamous epithelium composed of?
composed of flat, plate-like cells- arranged in many layers
What is the deepest layer of the epidermis?
the basal layer- cells layer, multiply and push upward
As the cells move superficially they…?
die and become filled with keratin
What is keratin?
a protein that provides skin with its waterproofing properties
The combining form for keratin is…?
kerat/o -also means horny or cornea
The basal layer also contains melanocytes. What do they do?
they produce and contain a black pigment
What is the black pigment that melanocytes produce called?
melanin
What is the combining form that means black or dark?
melan/o
What does the melanin do?
it protects the skin from some of the harmful rays of the sun and is responsible for skin pigmentation
What is the absence of normal pigmentation called?
albinism
What does true albinism mean?
the hair, skin, and eyes have no pigmentation
The dermis is…?
the layer directly deep to the eipidermis
What is the dermis also called?
the corium
The dermis is composed of …?
blood and lymph vessels, nerve fibers, the accessory organs of the skin, and connective tissue
The connective tissue of the dermis contains what cells?
fibroblasts, collagen, histiocytes, mast cells, histamine, heparin, perception (tactile perception)
What are fibroblasts?
fiber-producing cells (collagen is the major fiber in the dermis)
What is collagen?
tough, flexible, fibrous protein found in skin, bone, cartilage, tendons, and ligaments
Kolla in Greek means..? and -gen means…?
Kolla means glue and -gen means produce
What does histiocytes mean?
phagocytic cells (a cell that eats) that engulf foreign substances; also called tissue macrophages
What are mast cells?
cells that respond to insult by producing and releasing histamine and heparin
What is histamine?
chemical released in response to allergens that causes itching
What is heparin?
anticoagulant chemical released in response to injury
What is perception?
ability to recognize sensory stimuli - recognizes temperature, touch, pain, and pressure
What is tactile perception?
the ability to recognize touch sensation
What is the subcutaneous layer or hypodermis?
located deep to or under the dermis and is composed of connective tissue
The subcutaneous layer is contains a large amount of…?
fat or lipid
Adipocytes are …?
fat cells that produce lipid
Adip/o is the combining form for…?
fat
What are the layers of the epidermis?
1 - stratum corneum 2 - stratum lucidum 3. stratum granulosum 4. stratum spinosum 5. stratum basale
What is stratum corneum?
most superficial layer of the epidermis - consists of layers of dead, highly keratinized and flattened cells
What is called the horny layer?
stratum corneum
What is stratum lucidum?
layer immediately superficial to the stratum granulosum - is clear because of accumulation of keratin fibers (found in areas of high wear and tear such as foot pads)
What is stratum granulosum?
layer immediately superficial to the stratum spinosum.
What is stratum spinosum?
layer immediately superficial to the stratum basale - Keratinization desquamation begins in this layer
What is keratinization?
the development of the hard, protein constituent of hair, nails, epidermis, horny structures and tooth enamel
What is desquamation?
the process in which cell organelles gradually dissolve.
The stratum spinosum layer is also called …?
the prickle or spinous layer
What is stratum basale or stratum germinativum?
deepest or basal layer that continually multiplies to replenish cells lost from the epidermal surface
Appendages or structures associated with the skin include…?
glands, hair, fur, wool, feather, scale, claws, beaks, horns, and nails
What two main categories of skin glands are there?
sebaceous and sweat glands
Sebaceous glands or oil glands secrete an oily substance called?
sebum
Seb/o is the combining form that means…?
sebum or oily substance
Where are sebaceous glands located?
in the dermis and are closely associated with hair follicles
What are ducts?
tubelike passages - tiny ducts are called ductules
Why are sebaceous glands considered holocrine glands?
because the secreting cells and their secretions make up the discharge produced.
Where are sebaceous glands found?
in anal sacs, glands that produce musk, and circumoral and supracaudal glands, which cats use to mark territory when they groom and rub their tail
Sweat or sudoriferous glands are…?
aggregations of cells that are located in the dermis
Sweat glands are divided into 2 types, what are they?
eccrine glands and apocrine glands
What are Eccrine sweat glands and what do they produce and secrete?
are tiny, coiled glands that have ducts that open directly onto the skin surface through pores They produce and secrete water, salt, and waste (sweat)
Eccrine sweat glands are located…?
in various regions of the body depending on the species
What are apocrine glands and what do they produce and secrete?
found throughout the body and the free end or apical end of the cell is cast off along with the secretory products They produce and secrete a strong-smelling substance into the hair follicles
What do sweat glands do?
help regulate body temperature against hyperthermia and hypothermia
What is hyperthermia and hypothermia?
hyperthermia - high body temperture hypothermia - low body temperture
Hidrosis is ….?
the production and excretion of sweat
The combining form hidr/o means…?
sweat
Anhidrosis is…?
the abnormal reduction of sweating
Hyperhidrosis is …?
excessive sweating
Ceruminous glands are…?
modified sweat glands that are located in the ear canal
The ceruminous glands secrete…?
cerumen - ear wax
What is hair?
rodlike fibers made of dead protein cells filled with keratin
Pil/i, pil/o, and trich/o are the combining forms that mean…?
hair
What is the portion called that extends beyond the skin surface?
hair shaft
What is the hair shaft composed of …?
the cuticle cortex and medulla
The main component of the hair shaft is … and what is it responsible for?
cortex for coat color
What is the innermost component of the hair shaft?
medulla
What are hair follicles?
sacs that hold the hair fibers
What is the arrector pili?
a tiny muscle attached to the hair follicle that causes the hair to stand erect in response to cold temperatures or stress
What is it called when a dog “raises his hackles”?
piloerection - condition of hair standing straight up
What does guard hairs include?
tail and mane hair, bristly hair of swine and most of the fur hair
What are guard hairs, or primary hairs, or topcoat?
long, straight, stiff hairs that form the outer coat
What are secondary hairs or undercoat?
finer, softer, and wavy hair - include wool and wavy hair located near the skin of rabbits
What is tactile hair?
long, brittle, extremely sensitive hairs usually located on the face
What is vibrissae?
a form of tactile hairs but are longer than tactile hairs such as cat’s whiskers
What is cilia in hair and what is an example?
thin, short hairs - an example - eyelashes
What is simple pattern hair growth?
guard hairs that grow from separate follicular openings, as in cattle
What is compound pattern hair growth?
multiple guard hairs that grow from single follicles, as in dogs
Shedding is …?
normal hair loss caused by temperature, hormones, photoperiod (light), nutrition, and other nondisease causes
What do foot pad or tori provide?
cushioning and protection for the bones of the foot
Dogs and cats have _____ pads on the palmar and plantar surfaces of the phalanges.
digital
Metacarpal and Metatarsal pads are..?
singular pads located on the palmar and plantar surfaces of the metacarpal and metatarsal areas
Carpal pads are located…?
on the palmar surface of each carpus
Carpal pads do not _____ the weight when the animal is standing.
bear
Dogs and cats are called _______ animals because they walk on their toes, with only the digital and metacarpal and metatarsal pads making contact with the ground.
digitigrade
_______ animals have well-developed foot pads, such as those in primates
plantigrade
________ animals walk with phalanges, metacarpals and metatarsals, and carpal and tarsal bones making contact with the ground
plantigrade
In dogs and cats _____ and _____ are keratin plates covering the _____ surface of the _____ phalanx.
nails and claws dorsal distal
The dorsal and lateral surface of the claw is covered by the ______, and the ventral surface is the ____.
wall sole
What is the quick?
sensitive skin that is beneath the wall and sole containing numerous blood vessels and nerve endings
Name the parts of the cat’s foot
1-
2-
3-
4-
5-
______ is the term used to describe trimming thenail or claw to the level of the dermis.
Quicking
The combining form onych/o means…?
claw
_______ are the horny covering of the distal phalanx in ungulates or hooved animals such as equine, ruminants, and swine
Hooves
What are ungulates?
hooved animals such as equine, ruminants and swine
The combining form ungul/o means…?
hoof
In ruminants and swine, the foot pad is called the …?
bulb or heel
The pad of equine is called the …?
frog
The _____ is the dermis of the hoof and is located under the epidermal surface of the hoof wall, sole, and frog.
corium
The corium corresponds to the _____.
quick
Vestigial or rudimentary, structures of the integumentary system include…?
dewclaws, chestnuts and ergots
______ are rudimentary bones
Dewclaws