L.S. of Sycon
Anatomy of sycon: L.S. of Sycon
- The body wall is diploblastic, with an ectodermal or dermal epithelial layer on the outside and an endoderm or gastric epithelial layer on the inside.
In between the two layers, there is a non-cellular mesenchyme layer with interspersed monaxon and triaxon spicules.
The dermal epithelium is made by flat pinacocytes and is perforated by ostia.
The ostia branch into incurrent canals, which branch into radial canals lined with choanocytes via prosopyles.
The radial canals lead into small ex-current canals which are lined by pinacocytes.
The ex-current canals open into spongocoele. The canal system is of syconoid type.
T.S. of Sycon
Anatomy of sycon: T.S. of Sycon
- The body wall is diploblastic, consisting of an outer dermal layer and an inner gastric layer.
The gastric layer is composed of mesenchym with interspersed monaxcr and triaxon spicules and is lined internally with flat pinacocyte cells.
Additionally, flat pinacocytes are used to create the dermal layer, which is perforated by ostia.
The ostia leads into incurrent canals which, through prosopyles, lead into radial canals which are lined with choanocytes.
Pinacocytes line the radial canals, which lead into small ex-current canals.
The ex-current canals open into spongocoel. The canal system is of syconoid type.