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| sensitive vascular inner mesodermic layer of the skin |
| outer protective layer or covering of an animal, such as skin or a cuticle |
| epithelium (ěp'ə-thē'lē-əm) Pronunciation Key
Plural epithelia The thin, membranous tissue that lines most of the internal and external surfaces of an animal's body. Epithelium is composed of one or more layers of densely packed cells. In vertebrates, it lines the outer layer of the skin (epidermis), the surface of most body cavities, and the lumen of fluid-filled organs, such as the gut or intestine. epithelial adjective |