Integumentary Flashcards
Largest system of the body
Integument
The integumentary system is made up of what two parts
Cutaneous membrane
Accessory structures
Cutaneous membrane (skin) consists of what two types of tissues
1) keratinized stratified squamous epithelium
2) areolar (papillary layer of dermis)
Two components of cutaneous membrane
1) Epidermis (outer)
2) Dermis (inner)
Names for subcutaneous layer
Superficial fascia or hypodermis
Subcutaneous layer is located below what
Dermis
Subcutaneous layer (superficial fascia or hypodermis) is made of what type of tissue
Loose connective tissue
Functions of the skin
Protects (tissues and organs)
Excretes (salt, water, wastes)
Maintains (temperature - insulation and evaporation)
Synthesizes (Vit D)
Stores (lipids)
Detects (pressure, pain, temperature)
Type of tissue of epidermis
Keratinized stratified squamous epithelium
Is the epidermis vascular or avascular?
Avascular
Nutrients and O2 diffuse from what tissues into the epidermis
Dermis
Cells of the epidermis
Keratinocytes
Most abundant cells in the epidermis
Keratinocytes
Epidermis has how many strata of keratinocytes
5
Name the five strata of the epidermis
Stratum:
Germinativum Spinosum Granulosum Lucidum Corneum
Name the 4 types of cells of the epidermis
Keratinocytes
Langerhans’
Melanocytes
Merkel
Stratum germinativum is also known as
Stratum basale
The germinative layer is the
Stratum germiativum
Which strata has many stem or basal cells
Stratum germinativum
Of the structure of the epidermis, what strata builds a strong bond with the epidermis and dermis
Stratum germinatiu, (basale)
Forms epidermal ridges
Strata Germinativum (Stratum Basale)
Responsible for increasing the area of the basal lamina
Dermal papillae
Responsible for the strengthening the attachment between the epidermis and dermis
Dermal papillae
Layer of dead, protective cells made up of
Cells filled with keratin
Keratinization occurs on all exposed skin surfaces except
Eyes
Days for epidermis to move from Stratum Germinativum to the Stratum Corneum
15-30 days
Keratinization is the process in which the epidermis
Moves from the stratum germinativum to the stratum corneum and then forms a layer of dead, protective cells filled with keratin
Cells that make the majority of the epidermis
Keratinocytes
Cells of the epidermis containing macrophages
Langerhans’
Cells of the epidermis that protect against toxins, microbes, and other pathogens
Langerhans
Melanocytes are located in what stratum of the epidermis
Stratum basale (stratum germinativum)
Pigment producing cells of the epidermis
Melanocytes
Cells of the epidermis responsible for sense of touch
Merkel
Cells that produce Vitamin D
Epidermal cells
Vitamin D aids in the absorption of what to compounds
Calcium and Phosphorus
Disease causes by insufficient Vitamin D
Rickets
Responsible for anchoring accessory structures (hair, sweat glands) of the epidermis
Dermis
What are the two layers of the dermis?
Papillary layer (outer) Reticular layer (deep)
Reticular layer of dermis is made up of what tissue
Dense irregular connective tissue
Reticular layer is considered the deep or outer layer of the dermis
Deep
Papillary layer of the dermis is made from what type of tissue
Areolar
Dermis layer consisting of collagen and elastic fibers
Reticular layer
Fibers present in the dermis
Collagen fibers and elastic fibers (reticular layer)
Fibers of the dermis that provide the most flexibility
Collagen (resist stretching but bend easily)
Fibers of the dermis that permit stretching and then recoil to original strength
Elastic
Fibers in the dermis that limit the flexibility of collagen (to prevent damage)
Elastic
Terms used for flexibility and resilience of the dermis
Skin turgor
Monitors Merkel cells in the dermis
Tactile discs
Nerves that innervate the dermis control what three functions
Blood flow
Gland secretions
Sensory receptors
Exocrine glands of the skin
Sebaceous
Sweat
Sebaceous glands secrete
Sebum
Sebaceous glands are considered what type of glands
Holocrine
Sweat glands consists of what two types of glands
Apocrine
Merocrine (eccrine)
Sweat glands are responsible for what type of secretions
Watery
Two functions of sebum
Lubricates and protects
Inhibits bacteria
Sebaceous follicles
Discharge directly on skin surface
Produce sebum
Apocrine sweat glands are located
Armpits
Nipples
Groin
Apocrine glands secrete products into
Hair follicles
Produce sticky, cloudy secretions that cause odors when broken down
Apocrine
Merocrine (eccrine) sweat glands are located
Widely distributed throughout the body
Merocrine sweat glands are concentrated especially on what two parts of the body
Palms and soles of feet
Merocrine glands secrete (discharge) where
Skin surface
Glands that cool skin, excretes water and electrolytes, flushes toxins/pathogens from skin
Merocrine (eccrine)
Integumentary Glands
Sebaceous
Sweat
Mammary
Ceruminous
Earwax is produced by what integumentary gland
Ceruminous gland
Function of the ceruminous glands
Protect the eardrum
Hypodermis is also considered the
Subcutaneous layer
Two tissues that make up the subcutaneous layer
Elastic areolar
Adipose tissue
Hypodermis is connected to the what layer of the dermis
Reticular layer
Hypodermis is connected to the reticular layer of the dermis by what type of fiber
Connective tissue fibers
Few capillaries and no vital organs in this layer
Subcutaneous layer (hypodermis)
Hypodermic needles used for injections
In subcutaneous layer (hypodermis)
Responsible for pink color of skin
Hemoglobin
Skin reddens when blood vessels
Dilate
Bluish skin color is referred to as
Cyanosis
Melanocytes produce
Melanin
Melanin provides protection from
UV light
Found in stratum corneum
Carotene (produces yellowish tint to skin)
Jaundice caused by
Buildup of bile in the liver
Gland involved in Addison’s disease
Pituitary gland
Two other names for tension lines
Cleavage or Langer
Tension lines run transversely in what areas of the body
Neck and trunk
Tension lines run longitudinally in what area of the body
Limbs
Skins wrinkles are result of
Deteriorating elastic fibers that are not replaced
L. retinacula cutis refers to
Skin ligaments
Burns can be caused by
Temperature, UV, ionizing radiation, chemicals
Burns classified on
Depth and need for surgical intervention
Most severe burn
4th degree (numbers not used to classify other burns)
Percentage of body to be burned to be considered severe
20%
Classifications of burns uses what rule
Rule of nines
Risk of death by burns increased by what three factors
1) age > 60
2) > 40% surface area burns (partial-thickness and full-thickness)
3) inhalation injury
L. fasciae
Fascias
Tissue type of deep fascia
Dense, organized connective tissue (no fat)
Constitute wrapping, packing and insulting
Fascia
Cloaked sacs or envelopes of synovial membrane
Bursae
Specialized type of elongated bursae that around wrap around tendons
Synovial tendon sheaths
Delicate, serous membranes that are collapsed
Bursae
Most severe burn classification
4th degree
delicate connective tissue membrane capable of secreting fluid to lubricate a smooth internal surface
bursae
bursae are closed sacs or envelopes of what type of membrane
synovial
facilitates movements over tendons over bone
subtendinous bursae
lies beneath the deep fascia
subfascial bursae
occurs in the subcutaneous tissue between the skin and bony prominences
subcutaneous bursae
elongated bursae that wrap around tendons, enclose tendons that transverse osseofibrous tunnels that anchros tendons in place
synovial tendon sheaths
communicate with synovial cavities of joints
bursae
responsible for goose bumps
arrector muscle of hair follicule
layer in considered to be the skin
hypodermis
Cutaneous membrane of skin
keratinized stratified squamous epithelium
aerolar (dermis - papillary layer)
Skin
keratinized stratified squamous epitheliuem
aerolar (dermis)
reticular (dermis)
Dead cells, represented only by flat membranous sacs filled with keratin; glycolipids in extracellular space
stratum corneum
Flattened cells; organelles deteriorating; cytoplasm full of lamellated granules (release lipids) and keratohyaline granules
stratum granulosum
contain thick bundles of intermediate filaments made of pre-keratin
stratum spinosum
cells actively mitotic stem cells; some newly formed cells become part of the more superficial layers
stratum basale