The skin of the body, consisting of dermis and epidermis.
The skin and all of its related components, such as nails,
hairs, hooves, and horns.
A tough, waterproof protein that makes up scales, the outer sheaths of
beaks and claws, and feathers; a main component of the epidermis, nails, hair,
horns, and hooves.
The normal formation of keratin (a tough, waterproof protein)
inside epithelial cells of the skin. As the epithelial cells mature, they fill with
granules filled with keratin.
A fat-soluble vitamin essential for life in most organisms. Vitamin D
may be found in many common food sources, as well as produced in the skin
when exposed to ultraviolet rays in sunlight. An insufficient amount of vitamin
D can cause rickets or osteomalacia.
Compose of keratinized stratified squamous epithelium, it is the
outermost layer of the skin.
The deep, connective tissue portion of the skin that contains blood
vessels, glands, and hair follicles.
The layer of adipose tissue located beneath the epidermis and
dermis that insulates and protects the body.
The layer of adipose tissue located beneath the epidermis
and dermis that insulates and protects the body.
Cells that synthesize keratin. They have three distinct stages
visible in the epidermis: the
cell stages. As
keratinocytes travel progressively away from the basement membrane toward
the superficial epithelium, they lose their organelles to make way for more
keratin. As a result of this process, the cells die by the time they reach the
Cells located within the lower epidermis that process tyrosinase
and melanin. Melanin, contained within melanosomes, is transferred to
keratinocytes by way of the melancoyte’s long projections.
that sulfurous pigment produced by melanocytes, especially when
stimulated by sunlight. Melanin is present in the skin, hair, choroid of the eye,
and abnormally in melanomas.
Granules filled with melanin that are transferred from the
melanocytes to the keratinocytes.
14. Langerhans cell:
The macrophages of the epidermis that phagocytize invading
microorganisms and produce antigens.
15. Merkel cells:
Throught to aid in the sensory function, these cells are located in
small numbers within the epidermal-dermal junction.
16. Merkel disk:
the junction formed by Merkle’s cells and sensory nerves.
17. Stratum germinativum:
The base layer of the epidermis, composed of a single
layer of cuboidal cells that divide to replenish the constantly eroding superficial
layer of the epidermal.
18. Stratum basale: