Nuchal organ

The nuchal organ is a ciliated pit or groove present at the posterior end of the prostomium of annelid worms, some cephalopods, and other invertebrates.

Annelids only possess one nuchal organ, although the nature of the grooving may make it appear to be a pair of organs.

单词	Nuchal groove
释义	Nuchal groove 英语百科 Nuchal organ The nuchal organ is a ciliated pit or groove present at the posterior end of the prostomium of annelid worms, some cephalopods, and other invertebrates. Annelids only possess one nuchal organ, although the nature of the grooving may make it appear to be a pair of organs.
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Nuchal groove

Nuchal organ