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Pinacoderm
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<h2 id="structure">Structure</h2> <p>The pinacoderm is composed of <a href="/facts/Pinacocyte/RNxUIT2S">pinacocytes</a>, flattened epithelial cells that can expand or contract to slightly alter the size and shape of the sponge.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> It also contains <a href="/facts/Porocytes/g8QxsDbS">porocytes</a>, oval-shaped cells extending from the pinacoderm to the <a href="/facts/Choanoderm/L36Vc9yv">choanoderm</a> (the body layer containing <a href="/facts/Choanocytes/KlA8Bp9M">choanocytes</a>). </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Charles F. Lytle; John R. Meyer (2005). General Zoology Laboratory Guide (Fourteenth ed.). <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>