Another term used when referring to the skin
Organ system that includes the skin and its appendages, or derivatives, including har, nails, and related glands
Derived from ectoderm, the same embryonic cell layer that gives us the brain, spinal cord and special senses. Contained in its layers are melanocytes, which contribute to the color of the skin, hair and eye iris & absorption of lUV light. Also contains pores; these openings allow passage for hair and specialized glands. Relatively avascular.
Also known as corium, or hide, it is the true skin.
Main compenent of connective tissue is an insoluble, fibrous protein that constitutes 70% of the dermis - Offers Support to nerves, blood vessels, hair folicles and glands.- Elastin provides elasticity
4 Epidermal Layers. - Mainly found in the palms of hands and soles of feet.
The deepest layer of the epidermis. Undergoes continuous cell division and generates all other layers
The prickly layer us a bonding and transitional layer between the stratum granulosum and the stratum germinativum, possessing cells of both these layers.
This layer is 3-5 cells deep and also marks the beginning of change before the drying of the tissue
A translucent layer in the thick skin of the hands and feet.
Outermost later of the skin.
Epidermal cells that are filled with an extremely tough, fibrous protein which provides protection by waterproofing the skin's surface. They make up more than 90% of epidermal cells and form the principal structures of outer skin. THese cells are dead and begin shedding at the skin's surface, only to be replaced by cellsfrom the deeper epidermal layers.
This epidermal cell/skin pigment contributes color to the skin and serve to decrease the amount of UV light that can penetrate into the deeper layers of the skin.
Condition in which the individual cannot produce melanin.
partial or total loss of skin pigmentation which occurs in patches. This maybe as the result of a burn or scar that damages the melanocytes in a given area of the body.
An Epidermal cell type thought to play a limited role inimmunological reactions that affect the skin.
Langer's Cleavage Lines
Deeper sections of the dermis are charaterized by dense bundles of white collagenous fibers that arrange themselves in patterns
Superficial Fascia or Hypodermis - not a true region of skin but rather a loose layer rich in fat and aerolar connective tissue.
Muscles of the hair
Oil Glands, secrete sebum. rich in chemicals such as triglycerides, waxes, fatty acids and cholesterol which are mildle antibacterial and antifungal, lubricating bothe hair and the epidermis.
Sweat Glands, secrete sweat or perspiration
Eccrine Sweat Glands
Most numerous, widespread and important sweat glands
Apocrine Sweat Glands
located in the deep subcutaneous layer in the axillary region, the aerola of the breast and the pigmented skin around the anus.
Special variety of modified apocrine glands that release its secretionn of the surface of the external ear canal.
main and most visible part of the nail
the skn beneath the nail; it appears through the clear nail
Eponychium is the tough ridge of skin that grows out over the nail from its base.
Heavily keratinized, nonliving tissue that forms the thin hard plates found on the distal surfaces of the fingers and toes.
Free Nail Edge
Distal portion of the nail
Basal Cell Carcinomas
accoutn for approx. 75% of all cancers of the skin - slow growing characterized by lesions that begin with small raised nodules that ulcerate.
Squamous Cell Carcinomas
account for approx. 20% of all cases of skin cancer - begins as a scaly pigmented area that may develop into an ulcerated crater
Group of Mealnocytes that has mutated into cancer. Account for approx. 5% of all skin cancers; typically begins as raised dark lesion with irregular borders and appears uneven in color.