Cuticle
Cuticle
The Cuticle (/ˈkjuːtɪkəl/), derived from the Latin cuticula, meaning "small skin", is a term used in various branches of biology. In zoology, it refers to a multi-layered structure outside the epidermis of many invertebrates, notably roundworms and arthropods, that provides body protection. In botany, cuticle refers to a protective film covering the epidermis of leaves, young shoots and other aerial plant organs. In human anatomy, cuticle refers to various structures that function as a protective layer.
Zoology
In zoology, the cuticle or cuticula is a multi-layered structure outside the epidermis of many invertebrates, notably roundworms and arthropods, including insects, spiders, and crustaceans. It provides protection, structural support, and a means of sensing the environment. The cuticle is secreted by the underlying epidermis.
Botany
In botany, the cuticle is a water-impervious protective layer covering the epidermis of leaves, young shoots and other aerial plant organs. It consists of lipid and hydrocarbon polymers impregnated with wax, and is synthesized exclusively by the epidermal cells.
Human Anatomy
In human anatomy, the term cuticle refers to several structures. In human nail anatomy, cuticle refers to the dead tissue that is pushed up from the nail bed onto the nail plate. In hair, the cuticle is the outermost part of the hair shaft. It is formed from dead cells, overlapping in layers, which form scales that give the hair shaft strength and provide protection for it.
Related Terms
External links
- Medical encyclopedia article on Cuticle
- Wikipedia's article - Cuticle
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