Nuchalorgan

As Nuchalorgane paired sense organs of polychaetes are known, which are located in the head region and act as a chemoreceptor. There are fields of ciliated cells at the head lobe or in the area of the mouth segment, which are mainly responsible for the chemical testing of food ( taste).

Resources and training

Nuchalorgane come exclusively with the Vielborstern ( Polychaeta ) in front within the segmented worms ( Annelida ), can be highly different on there. The formerly classified here as a separate phylum spray worms ( Sipuncula ) they form ciliated areas in the mouth area between a crown of tentacles, whose nervous connection comes directly from Oberschlundganglion. In other polychaetes the Nuchalorgane are mostly as strongly ciliated structures at the posterior margin of the prostomium.

The Amphinomida, whose most famous representative of the fire worm ( Hermodice carunculata ), the Nuchalorgan ( caruncle ) forms a conspicuous ridge and behind the prostomium. For only in 2010 Teuthidodrilus discovered (known as " squidworm " ) the Nuchalorgane than six couples are formed, which rise along with several very long tentacles on the head and are greatly extended.

Documents

• Sense organ
• Anatomy (eddy lots)