Pinacocyte
Pinacocytes are flat cells found on the outside of sponges, as well as the internal canals of a sponge.[1] Pinacocytes are not specific to the sponge however. It was discovered that pinacocytes do not have as many sponge specific genes. These genes suggest that pinacocytes had evolved before the metazoan time period, which is, before porifera had evolved.[2]
Function
[edit | edit source]Pinacocytes are part of the epithelium in sponges. They play a role in movement (contracting and stretching), cell adhesion, signaling, phagocytosis, and polarity.[2] Pinacocytes are filled with mesohyl which is a gel like substance that helps maintain the shape and structure of the sponge.[3]
Types
[edit | edit source]Basipinacocytes
[edit | edit source]These are the cells in contact with the sponge's substrate (the surface to which it is attached).
Exopinacocytes
[edit | edit source]These are found on the exterior of the sponge. Exopinococytes produce spicules which is a needle like process that serves as structure for the organism.[1]
Endopinacocytes
[edit | edit source]These line the sponge's interior canals.
References
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