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The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. [1] The epidermal layer provides a barrier to infection from environmental pathogens [2] and regulates the amount of water released from the body into the atmosphere through transepidermal water loss.
The skin of the face is thicker than the skin overlying the lips where blood vessels are closer to the surface. As a consequence, the margin of the lips shows a transition between the thicker and thinner skin, represented by the vermilion border. It therefore has the appearance of a sharp line between the coloured edge of the lip and adjoining ...
The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]
The word ectoderm comes from the Greek ektos meaning "outside", and derma meaning "skin". [2] Generally speaking, the ectoderm differentiates to form epithelial and neural tissues (spinal cord, nerves and brain). This includes the skin, linings of the mouth, anus, nostrils, sweat glands, hair and nails, [3] and tooth enamel. Other types of ...
A mucocutaneous junction, or mucocutaneous boundary, is a region of the body in which mucosa transitions to skin. Mucocutaneous zones occur in animals, at the body orifices. In humans, mucocutaneous junctions are found at the lips, nostrils, conjunctivae, urethra, vagina (in females), foreskin (in males), clitoral hood (in females), and anus.
Cupid's bow feature of a human lip. The upper and lower lips are referred to as the labium superius oris and labium inferius oris, respectively. [2] [3] The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, [4] and the typically reddish area within the borders is called the vermilion zone. [5]
It consists of one or more layers of epithelial cells overlying a layer of loose connective tissue. It is mostly of endodermal origin and is continuous with the skin at body openings such as the eyes , eyelids , ears , inside the nose , inside the mouth , lips , the genital areas , the urethral opening and the anus .
They are the two skin folds that run from each side of the nose to the corners of the mouth. They are defined by facial structures that support the buccal fat pad. [3] They separate the cheeks from the upper lip. The term derives from Latin nasus for "nose" and labium for "lip".