Chapter 6 Flashcards
The integumentary system includes
skin, nails, hair and glands
dermatology is the study of
the integumentary system
the largest organ of the body
skin
skin is made up of
the epidermis and the deeper dermis
thick skin covers…
the palms, soles of feet, surfaces of fingers and toes (contains sweat glands)
thin skin covers…
covers the rest of the body and contains hair follicles, and sebaceous glands as well as sweat glands
six functions of skin
resistance to trauma and infection, barrier functions, vitamin D synthesis, sensation, thermoregulation, nonverbal communication
the epidermis is
keratinized stratified squamous epithelium
5 types of cells in epidermis
stem cells, keratinocytes, melanocytes, tactile, dendritic
strata of the epidermis
stratum basale, stratum spinosum, stratum granulossum, stratumlucidum
the dermis is
a connective tissue layer beneath the epidermis that is composed mainly of collagen but contains elastic and reticular fibers, fibroblasts
two zones of the dermis
papillary layer and reticular layer
hypodermis or subcutaneous tissue has
an indistinct boundary but contains more areolar and adipose tissue; it binds skin to the underlying tissues
skin color is produced by
pigment molecules
2 forms of melanin
brownish-black eumalanin and reddish-yellow phemelanin which contains sulfur
accessory organs of the skin
hair, nail, cutaneous glands
hair and nail are composed mostly of
hard keratin
a hair is also known as a
pilus
3 different types of hair
languo, vellus, terminal
3 zones of hair
bulb, root, shaft
3 layers of hair
medulla, cortex, cuticle
a diagonal tube that extends into the dermis and even the hypodermis
hair follicle
stages of hair growth
anagen, catagen, telogen
aplopecia
thinning of hair
