The coelenteron is subdivided by a number of vertical partitions, known as mesenteries or septa. The mesenteries or internal tissue walls are few. The coelom is divided into a number of interconnecting spaces by mesenteries. There are up to twenty pairs of perfect mesenteries (internal partitions) with strong retractors. The gonads are strips of tissue within the mesenteries. The functional significance of the mesenteries in sea anemones is unclear. The tumors often spread to the mesenteries and the liver. It comprises those sea anemones with atypical arrangement of mesenteries for actiniarians. It comprises those sea anemones with typical arrangement of mesenteries for actiniarians. It lives within the mesenteries, peritoneum, and in the subcutaneous tissue. Each of these plates is flanked by a pair of mesenteries. The gonads are situated on the mesenteries alongside the mesenterial filaments. In type IV polycystic masses occur only in the mesenteries. Soft corals, order Alcyonacea, have eight primary mesenteries which alternate with the eight tentacles. The mesenteries are complete and unpaired and bear unilobed filaments.