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Lecture 6
Integumentary System
35
Anatomy
Undergraduate 1
02/18/2012

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Term
The three fundamental layers of cells
Definition
-epidermis
-dermis
-hypodermis
Term
Basic functions of the integument
Definition
-protection
-thermoregulation
-immune function
-production of vitamin d
-excretion
-communication
Term
cutaneous membrane
Definition
-epidermis
-dermis
Term
Subcutaneous layer
Definition
hypodermis
Term
stratum basale
Definition
One of the three layers of the epidermis
— the bottommost layer consists of simple cuboidal or columnar e.t.
— keratinocytes capable of dividing
— melanocytes
— touch and pressure detecting cells
Term
Stratum spinosum
Definition
One of the three layers of the epidermis
— middle layers consist of stratified cuboidal e.t.
— keratinocytes that are non-dividing and beginning to fill with the protein keratin
— some dendritic cells that function in immunity
— some melanocytes
Term
Stratum corneum
Definition
One of the three layers of the epidermis
— stratified squamous e.t.
— composed of corneocytes
— completely dead and filled with the protein keratin
— cells slough off in a process called de-squamation
Term
keratinocyte
Definition
-One of the most common types of cells that comprises the epidermis
-produce keratin
Term
melanocyte
Definition
One of the most unusual and prominent cells that comprises the epidermis. Occurs primarily in areas of the body exposed to ultraviolet light and produces melanin.
Term
Papillary region
Definition
The most superficial layer of the dermis
Term
Reticular region
Definition
The more deeper layer of the dermis. Contains the secretory portion of sweat glands, oil glands, and hair follicles
Term
hypodermis
Definition
— composed of adipose connective tissue and loose connective tissue.
— functions in insulation, as an energy reservoir, and loosely binds skin to underlying structures
Term
sebaceous gland
Definition
Associated with hair follicles. Produces an oily secretion called sebum.
Term
arrector pili
Definition
A smooth muscle that is attached to each hair follicle. When contracted during cold or fright it causes the hair to stand on end.
Term
medulla
Definition
Inner portion of a hair shaft
Term
shaft
Definition
Visible portion of hair
Term
root
Definition
Part of hair that lies beneath the surface of the skin
Term
hair follicle
Definition
Tube-like structure that invaginates into the dermis.
Term
cortex
Definition
outer portion of a hair shaft
Term
nails
Definition
thick, keratinized epidermal cells that occur on fingers and toes
Term
lunula
Definition
whitish crescent found on nail beds
Term
Sweat (sudoriferous) glands
Definition
the most common type of skin glands. classified as either eccrine or apocrine glands.
Term
Eccrine Glands
Definition
he most numerous sweat glands in the body. They produce a thin, watery secretion that has aboundant salts, ammonia, wric acid, and other traces of minerals. They function to eliminate waste products, but serve a primary function in thermoregulation.
Term
Apocrine Glands
Definition
Specialized sweat glands that release pheromones. located deep in the hypodermis in the axillae, inguinae, areolae of the breast, and the anus.
Term
Ceruminous Glands
Definition
modified apocrine glands that occur in the external auditory canal. The secretions mix with sebaceous gland secretions to form a yellowish waxy secretion called cerumen. It has a waterproofing effect and antifungal effects.
Term
Integumentary system
Definition
Skin, exocrine glands in skin, hair and nails
Term
Skin
Definition
The largest organ in the body in terms of area
Term
Epidermis
Definition
-topmost/uppermost layer
-keratinized stratified squamous epithelium
-avascular
-consists of 4 or 5 layers
Term
Dermis
Definition
-middle layer
-dense irregular connective tissue
-contains nerve endings, hair follicles, glands
-dermal papillae
Term
Hypodermis or superficial fascia
Definition
-subcutaneous tissue underneath dermis
-stores fat and helps anchor skin
-areolar CT and adipose tissue
Term
Stratum lucidum
Definition
-only seen on thick skin
-2-3 layers of dead, anucleate cells
Term
Stratum corneum
Definition
-20-30 layers of dead, anucleated cells
-outer cells are constantly shed
Term
Merkel cells (tactile cells)
Definition
-stratum basale
-tactile (touch) sensation
Term
Langerhans cells
Definition
-stratum spinosum
-ingest bacteria and foreign debris
Term
sweat glands
Definition
release persperation
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