Integumentary System Flashcards
is the part of the hair that is above the skin.
Shaft
Simple, coiled, tubular glands that open directly
onto the surface of the skin through sweat pores
Eccrine Sweat Glands
thick, coarse hair that grows on your
scalp and makes up your eyelashes and eye brows.
After puberty, terminal hair may also grow on your
face, armpits, pubic area, chest and belly.
Terminal Hairs
Two regions of the Dermis
Papillary Region
Reticular Region
surrounds the medulla and forms the
bulk of the hair
Cortex
Functions of Integumentary System
Regulated body temperature
Stores blood
Protects the body from external environment
Detects Cutaneous sensations
Excretes and Absorbs Substances
Synthesizes Vitamin D
Composed of keratinized stratified squamous
epithelium
Epidermis
Layers of the Epidermis (Deep to Superficial)
Stratum Basale
Stratum Spinosum
Stratum Granulosum
Stratum Lucidum
Stratum Corneum
Intraepidermal macrophages and
projections of melanocytes are present in
this layer
Stratum Spinosum
forms fingerprints and footprints
Dermal Papillae
The least numerous of the epidermal cells. They
are located in the deepest later of the epidermis
Tactile Epithelial Cells
Consist of 4-5 layers of flattened
keratinocytes that are undergoing
apoptosis
Stratum Granulosum
lies below the surface of the skin
Root
central axis of the hair
Medulla
an oily, white substance rich in lipids. A
lubricant
Sebum
2 stages in hair growth
growth and resting stage
assembles keratin
intermediate filaments into keratin
Keratohyalin
2 types of sweat glands
Eccrine Sweat Glands
Apocrine Sweat Glands
a tough, fibrous protein that helps
protect the skin and underlying tissues from
abrasions, heat, microbes, and chemicals.
Keratin
Mat of collagen and elastic fibers; consist of dense
irregular connective tissue as well as blood vessels,
sweat and oil glands, and deep pressure receptors
called Lamellar Corpuscles
Reticular Region
Functions of Hair
Hair on the head guards the scalp from injury and the
sun’s rays
It decreases heat loss from the scalp
Eye browns and eye lashes protect the eyes from
foreign particles
Hair in the nostrils protect the respiratory tract from
foreign substances
Sensing light touches
four principal types of cells in epidermis
o Keratinocytes (90%)
o Melanocytes (8%)
o Intraepidermal Macrophages
o Tactile Epithelial Cells
is a thin plate consisting of layers of dead
stratum corneum cells that contain a very hard type
of Keratin
nail
Consist on average of 25 to 30 layers of
flattened dead keratinocytes
Stratum Corneum
