Week 8- Integumentary System Flashcards
What are the 3 layers of the skin from most external to internal?
- Epidermis
- Dermis
- Subcutaneous layer
a thin, cellular membrane layer that contains keratin
Epidermis
dense fibrous connective tissue layer that contains collagen
Dermis
a thick, fat-containing tissue
Subcutaneous layer
The ______ LACKS blood vessels, lymphatic vessels or connective tissue so it is dependent on the deeper ________ and its rich network of capillaries for nourishment
Epidermis; dermis layer
the epidermis is composed of ___________ that are flat and scale-like
squamous epithelium
The deepest layer of the epidermis is the ________ layer; cells here are constantly growing and multiplying and are the source of all the other cells in the epidermis
basal layer (stratum basale)
most superficial layer of the epidermal layer
stratum corneum
melanocytes are contained in what layer of the epidermis?
basal layer
what cells contain melanin?
melanocytes
what skin pigment is more common and is a brown-black pigment
Eumelanin
what skin pigment is a red-yellow pigment seen in people with lighter skin
Pheomelanin
a protein that is elastic and helps skin to return to its original position when pinched or poked
elastin
a fibrous protein found in bone, cartilage, tendons and ligaments and skin; it is tough and resistant but also flexible
collagen`
_______ cells are predominant in the subcutaneous layer
Adipocytes (fat cells)
semilunar whitish region at the base of the nail plate - it can generally be seen in the thumbnail of most people
Lunula
soft tissue surrounding the nail border
Paronychium
what layer are sebaceous glands located?
dermal layer of the skin
the most common type of sweat gland, originate deep in the dermis and straightens out to extend up through the epidermis
Eccrine sweat glands
active only from puberty onward and larger in size; are found concentrated in the area of reproductive organs and axilla;
Apocrine sweat glands
Perspiration is controlled by the__________ nervous system
sympathetic
bluish-purple mark (bruise) on the skin that are caused by
hemorrhages into the skin after injury
Ecchymosis
mall, pinpoint hemorrhages
Petechiae
absence of hair from area where it normally grows
alopecia
itching - common symptom a/w most forms of dermatitis and other conditions as well
Pruritus
