CH. 5 Integumentary system

sudoriferous gland

sweat gland

reticular layer

deeper layer of the dermis; it has reticulated appearance due to the presence of abundant collagen and elastin fibers

merkel cell

Receptum cell in the stratum basale of the epidermis that responds to the sense of touch

Langerhan’s cell

specialized dendritic cell found in the stratum spinosum that functions as a macrophage

hypodermis

connective tissue connecting the integument to the underlying bone and muscle

epidermis

outermost tissue layer of the skin

eczema

skin condition due to an allergic reaction; which resembles a rash

dermis

layer of skin between the epidermis and hypodermis, composed mainly of connective tissue and containing blood vessels, hair follicles, sweat glands, and other structures

basal cell carcinoma

cancer cell that originates from basal cells in the epidermis of the skin

arrector pili muscle

smooth muscle that is activated in response to external stimuli that pull on hair follicles and make the hair “stand up”

dermal papilla

extension of the papillary layer of the dermis that increases surface contact between the epidermis and dermis

eleiden

clear protein-bound lipid found in the stratum lucidum that is derived from keratohyalin and helps to prevent water loss

hair matrix

layer of basal cells from which a strand of hair grows

keloid

type of scar that has layers raised above the skin surface

melanin

pigment that determines the color of hair and skin

albinism

genetic disorder that affects the skin, in which there is no melanin produced

hair papilla

mass of connective tissue, blood capillaries, and nerve endings at the base of the hair follicle

melanoma

type of skin cancer that originates from the melanocytes of the skin

sebaceous gland

type of oil gland found in the dermis all over the body and helps to lubricate and waterproof the skin and hair by secreting sebum

vitiligo

skin condition in which melanocytes in certain areas lose the ability to produce melanin, possibly due an autoimmune reaction that leads to loss of color in patches

anagen

active phase of the hair growth cycle

eccrine sweat gland

type of sweat gland that is common throughout the skin surface; it produces a hypotonic sweat for thermoregulation

keratin

type of structural protein that gives skin, hair, and nails its hard, water-resistant properties

meissner corpuscle

(also, tactile corpuscle) receptor in the skin that responds to light touch

pacinian corpuscle

(also, lamellated corpuscle) receptor in the skin that responds to vibration