cuticle


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

cuticle

1. dead skin, esp that round the base of a fingernail or toenail
2. another name for epidermis
3. any covering layer or membrane
4. the protective layer, containing cutin, that covers the epidermis of higher plants
5. the hard protective layer covering the epidermis of many invertebrates

Cuticle

 

(1) In animals, a solid formation on the surface of cells of epithelial tissue. In invertebrates, a derivative of cells of the single-layered integumental epithelium, or hypodermis. The functions of the cuticle are chiefly protective and supportive. In worms and arthropods, it forms a tough body covering. The composition of cuticle includes chitin (which, together with mineral substances and proteins, provides mechanical strength) and lipids (which make the cuticle impervious to water).

In vertebrates, which have a multilayered integumental epithelium to perform the protective function, the cuticle is found mainly on the surface of the epithelial cells that line the viscera (the intestines, the air passages of the respiratory organs, parts of the uriniferous tubules of the kidneys, and the urinary tracts). Each cell has its own cuticle, which is represented completely by the microvilli (the surface of a single cell of the small intestine in man having as many as 2,000). The activity of certain enzymes (for example, alkaline phosphatase, invertases, and maltases) has been discovered in the cuticle, testifying to the active participation of the cuticle in the functional activities of the organs.

(2) In plants, the cuticle is the thin protective film covering the epidermis of the leaves and stems and consisting of cutin. The cuticle is an unstructured formation, lacking corpuscular or fibrillar elements. It is resistant to chemical influences. It is absent in the underwater organs of aquatic plants, and it is poorly developed in plants that live in shade or damp soil. It is especially well developed in plants that must limit transpiration. The smooth, shiny cuticle of the leaves of tropical plants reflects some of the sunlight striking the plants and serves as a shield against excessive insolation. In many xerophytes, the protective properties of the epidermis are reinforced beneath the cuticle by a cuticular layer, which consists of a mixture of polysaccharides, cutin, and waxes. In the majority of xerophytes, the cuticular layer holds pale yellow pigments, which help make the cell wall impenetrable to ultraviolet rays.

M. E. ASPIZ

cuticle

[′kyüd·ə·kəl]
(anatomy)
The horny layer of the nail fold attached to the nail plate at its margin.
(biology)
A noncellular, hardened or membranous secretion of an epithelial sheet, such as the integument of nematodes and annelids, the exoskeleton of arthropods, and the continuous film of cutin on certain plant parts.
References in periodicals archive ?
Keravis is a powerful hair strengthening active that acts on all of the three fundamental parameters of hair strength: tensile properties, bending modulus and cuticle abrasion.
The nail and cuticle oil nourishes the nails and surrounding area.
The thick cuticle is with micropapillae and the on the epiderma is seen papillae.
Pycnogonids are ideal for this study because they are often found harboring epibionts (Pipe, 1982; Key et al., 2013), and they lack a true respiratory system (Arnaud and Bamber, 1987), relying instead on the diffusion of oxygen directly across their thin cuticles or through pores piercing the cuticle (Davenport et al., 1987; Lane et al., unpublished data).
It also creates an endless cycle of cuticle trimming as the growing cuticle can often look frayed - and thus creates the need for them to be cut over and over again.
These work just like temporary tattoos Rad Nails Cuticle Tattoos, $6, radnails.com
Rod Anker, Creative Director of Monsoon Salon and Spa said that he prefers Magic Serum from Schwarzkopf because it closes the cuticle instantly and ensure a shinny glossy finish each and every time.
For those who like the bare look, there's a rub of oil for the nails and cuticles.
As a major chemical constituent, the cuticle is normally composed of a cutin and/or cutan biopolymer matrix, waxes both intruded into (intracuticular) and deposited on to (epicuticular) the matrix, polysaccharides, and phenolics [6].
These few simple hand and nail care tips it won't let ragged cuticles and cracked skin detract from your fabulous nail art.
Calcite and amorphous calcium carbonate are the most abundant and most acid vulnerable of the cuticle minerals.