Abstract
The cnidarian integument consists of a single-layered epidermis, the outer surface of which is coated with an extracellular material (see Chap. 7, this Vol.); the inner surface rests on a gelatinous mass, the mesoglea, which forms the core of the body wall. This epidermal cell layer covers the entire body of the polyp from the tentacles to the pedal disc, forming a boundary with the external medium. The structure of the medusa is more complex; here the epidermis covers the bell (as the exumbrella), lines the subumbrellar cavity (subumbrellar and manubrial epithelium), and clothes all the external appendages, such as the velum and tentacles. As in many aquatic invertebrates, the epidermis of cnidarians frequently bears flagella and/or microvilli, the latter suggesting that substances can be taken up directly from the surrounding medium (see Chap. 8, this Vol.).
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Hündgen, M. (1984). Cnidaria: Cell Types. In: Bereiter-Hahn, J., Matoltsy, A.G., Richards, K.S. (eds) Biology of the Integument. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-51593-4_5
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DOI: https://doi.org/10.1007/978-3-642-51593-4_5
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