APHY 101 Ch 5: Layers of the skin Diagram | Quizlet

Epidermis

the outermost layer of skin, provides a waterproof barrier and creates our skin tone

Sebaceous gland

produces and secretes an oily substance that lubricates the skin and hair.

Epidermis

the outermost layer of skin, provides a waterproof barrier and creates our skin tone

Sebaceous gland

produces and secretes an oily substance that lubricates the skin and hair.

Free nerve ending

is an unspecialized, afferent nerve fiber ending of a sensory neuron

Dermis

contains connective tissue, hair follicles, and sweat glands

Hypodermis

deeper subcutaneous tissue; is made of fat and connective tissue

eccrine gland

The sympathetic nervous system stimulates this sweat gland to secrete water to the skin surface, where it cools the body by evaporation. It is an important mechanism for temperature control.

stratum basale

the deepest layer of the epidermis consisting of row of stem cells (capable of undergoing cell division to form new cells), newly-formed keratinocytes, melanocytes, Merkel cells, and Dendritic cells

stratum spinosum

a layer of the epidermis with several rows of keratinocytes forming pre-keratin that provides strength and flexibility to the skin

stratum granulosum

a dark layer of the epidermis that marks the transition between the deeper, metabolically active strata and the dead cells of the more superficial strata

stratum lucidum

a thin, transparent layer of the epidermis found only in the thick skin of the fingers, palms, and soles; consists of dead keratinocytes

Stratum corneum

most superficial layer of the epidermis and is the layer exposed to the outside environment; consists of 20-30 rows of dead keratinocytes

Meissner's corpuscle

light touch receptor that responds to pressure and lower frequency vibrations

Pacinian corpuscle

a type of nerve ending located in the subcutaneous layer that is sensitive to pressure; also described as "lamellated"

Apocrine gland

Sweat glands in the pubic and underarm areas that secrete thicker sweat, that produce odor when in contact with bacteria on the skin

hair follicle

The tube-like depression or pocket in the skin or scalp that contains the hair root; made of both epidermis and dermis

dermal papilla

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

arrector pili muscle

An smooth (involuntary) muscle fiber attached to the underside & base of the hair follicle

hair bulb

deepest part of a hair strand; the thickened, club-shaped structure that forms the lower part of the hair root.