Exam #2 Chapters 5, 6, and 8 Flashcards
Dermis functions
Gives structural strength.
Connective Tissue with many fibers, fibroblasts, macrophages. Some adipocytes and blood vessels.
Contains nerves, blood vessels, hair follicles, smooth muscles, glands, and lymphatic vessels.
sensory functions of dermis
pain, itch, tickle, temperature, touch, pressure, two-point discrimination
how many layers of dermis. name the layers.
2 layers!
papillary layer
reticular layer
papillary layer of dermis
named for dermal papillae
attaches epidermis to dermis
nourishes the epidermis
consists of areolar tissue
contains: capillaries, lymphatic capillaries, sensory neurons
reticular layer of dermis
meshwork of DENSE IRREGULAR CT
COLLAGEN FIBERS (extend into papillary layer and hypodermis)
Structural strength and support
Elastin fibers
Allows for elasticity and stretch
Contains similar structures as papillary layer BUT ALSO SWEAT GLANDS AND HAIR FOLLICLES
Lines of cleavage, describe.
Formed by arrangement of collagen and elastin fibers in skin.
Significant for SURGERY and WOUND HEALING
Parallel to cleavage: better healing and less scarring Perpendicular to cleavage: remain open and more scarring.
Hypodermis
Separates skin from deeper structures.
Stabilizes skin to underlying tissues.
Allows independent movement.
Dominated by adipose tissue
Storage of energy
In men (accumulation): neck, arms, lower back, buttocks
In women: breasts, buttocks, hips, thighs
Both men/women: few cells on back of hands/surfaces of feet, more in abdominal region
Accessory Structures of Integumentary System
Sensory receptors
monitor external environment
Hair and hair follicles
produce hairs that protect skull
produce hairs that provide delicate touch sensations
Exocrine Sweat Glands
assist in thermoregulation
excrete wastes
lubricate epidermis
Nails
protect and support tips of fingers and toes
ACCESSORY STRUCTURES
sensory receptors (of integumentary) function
monitor external environment
ACCESSORY STRUCTURES
Hair and hair follicles (integumentary) function
produce hairs that protect skull
produce hairs that provide delicate touch sensations
ACCESSORY STRUCTURES
Exocrine Sweat glands (integumentary) function
thermoregulation
excrete waste
lubricate epidermis
ACCESSORY STRUCTURES
Nails (integumentary) function
protect and support fingers and toes
Epidermis
what are the skin sensory receptors located here?
Dermis
what are the skin sensory receptors located here?
EPIDERMIS
merkel cells
tactile discs (monitor epidermis)
free nerve endings
DERMIS
more specialized receptors
tactile corpuscles (in dermal papillae)
lamellate corpuscles (in reticular layer)
Merkel cells found in ________ layers of where?
Merkel cells found in DEEP layers of EPIDERMIS.
(skin sensory receptor)
free nerve endings
(epidermis skin sensory receptor)
extensions for pain and temperature
tactile corpuscles
(skin sensory receptor of dermis)
detect light touch
located in dermal papillae
lamellated corpuscles
(skin sensory receptor of dermis)
deep pressure/vibration
located in reticular layer of dermis
“lamellated” or “layers” - structure
protection… protection against what?
(integumentary system)
against UV light, microorganisms, water loss.
what kind of sensations?
(integumentary system?)
sensory receptors for temperature, touch, pressure, pain.
regulation… regulation of what?
(integumentary system)
temperature regulation
production… production of what?
(integumentary system)
vitamin D production
excretion… excretion of what?
(integumentary system)
very SMALL amount of waste product
Body’s first line of defense against environment?
Integument! (or skin)
2 major components of integumentary system are what?
cutaneous membrane
accessory structures