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Anatomy and Physiology
Chapter 5- Integumentary System
33
Anatomy
Undergraduate 1
12/16/2016

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Term
Dermatology
Definition
study of the structure, function, and disorders of the integumentary system
Term
Epidermis
Definition
superficial, thin layer made up of stratified squamous epithelial tissue and is avascular
Term
Dermis
Definition
deep, thick layer made up of connective tissue and is vascular
Term
Hypodermis
Definition
made up of areolar and adipose tissue, deep to the dermis
Term
Function of the skin
Definition
prevent dehydration, protection, defense against microorganisms, regulate body temperature, make Vitamin D, sensation
Term
Epidermal Ridges
Definition
series of ridges and grooves that increase surface area
Term
Dermal Papillae
Definition
small, nipple-shaped structures that project into the undersurface of the epidermis
Term
Corpuscle of touch
Definition
tactile receptors located in the dermal papillae also known as Meissner corpuscle
Term
Arrector pili muscle
Definition
smooth muscle that extends from the superficial dermis to the dermal root sheath around the side of the hair follicle
Term
Lamellated Corpuscle
Definition
pressure sensitive nerve endings
Term
Langerhans cells
Definition
cells that participate in immune responses; recognize microbes and destroy them
Term
Merkel cell
Definition
cells that detect touch sensations
Term
Keratin
Definition
tough, fibrous protein that helps protect the skin from abrasions, heat, microbes and chemicals
Term
Melanin
Definition
yellow-red or brown-black pigment that contributes to skin color
Term
Extensibility
Definition
the ability to stretch
Term
Elasticity
Definition
ability to return to original shape after stretching
Term
Shaft
Definition
superficial portion of the hair
Term
Hair Follicle
Definition
surrounds the root of the hair consists of the external and internal root sheath
Term
Bulb
Definition
onion-shaped structure at the base of the hair follicle. nourishes the hair follicle
Term
Sebaceous Gland
Definition
simple, branched acinar oil glands and secretes to the epidermis
Term
Sudoriferous Gland
Definition
releases sweat onto the epidermis
Term
Eccrine sweat glands
Definition
simple, coiled tubular glands that secrete sweat onto the surface of the skin
Term
Apocrine Sweat Glands
Definition
simple, coiled tubular glands that secrete oils through the armpit, groin, axilla, areolae and beard region of men
Term
Ceruminous Glands
Definition
modified sweat glands present in the external ear that impedes the entrance of foreign bodies
Term
Nail
Definition
tightly packed, hard, dead, keratinized epidermal cells covering the dorsal surface of the digits
Term
Nail body
Definition
visible portion of the nail
Term
free edge
Definition
nail body that extends past the distal end of the digits
Term
Nail Root
Definition
portion of the nail that is buried in a fold of the skin
Term
Lunula
Definition
whitish, crescent-shaped area of the proximal end of the nail body
Term
Hyponychium
Definition
thick layer of stratum corneum that secures the nail bed to the fingertip
Term
Eponychium
Definition
narrow band of epidermis that extends from and adheres to the lateral border of the nail wall
Term
Nail Matrix
Definition
epithelium proximal to the nail root that contains dividing cells that produces new nail cells
Term
Function of the nail
Definition
protect distal end of digit, support, allows for grasping and manipulation of small objects
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