Accessory Structures

Hair

Dead, keratinized epidermal cells, not on palms or soles, functions in protection, insulation, and sensing light touch

Hair Shaft

Hair that projects from the surface

Hair Root

Part of hair that extends into the dermis

Hair Follicle

Part of hair that surrounds the root, made of epidermal layers

Hair Bulb

Expanded base of the hair follicle, contains the matrix where hair grows

Sebaceous Gland

Glands that produce sebum, connected to hair follicles, not found in palms or soles

Sudoriferous Gland

Glands that secrete sweat, helps with excretion and body temp regulation

Ceruminous Gland

Modified sudoriferous gland, produces cerumen (ear wax), found in the external auditory meatus

Eccrine Gland

Sudoriferous gland that deposits sweat on the surface through ducts, found in most areas , regulates temp

Apocrine Gland

Sudoriferous glands found in the axilla and genitals, ducts open into hair follicles, produces odor when broken down

Nails

Plates of tightly packed, hard, keratinized epidermals cells

Nail Body

Visible part of the nail

Nail Free Edge

Part of nail that extends beyond the digit

Lunula

Cresent-shaped area of the nail

Eponychium

Cuticle, thickened epithelial tissue at the nail base

Hyponychium

Nail bed, attaches nail to the finger tip

Nail Matrix

Epithelial tissue below the nail that produces new nail cells

Epidermal Wound

Wound only involves superficial damage to the epidermal cells

Epidermal Growth Factor

Hormone that stimulates basal cells to divide and heal wounds

Corpuscle of Touch

Nerve endings in the papillary dermis, transmit sensations of light touch

Lamellated (Pacinian) Corpuscle

Nerve endings in the reticular dermis, transmit sensations of deep pressure