retrocerebral sac

retrocerebral sac
1. (CHAETOGNATHA)
A pair of sacs imbedded in the posterior part of the cerebral ganglion, separated by a membrane but connected by a nerve proximally, and opening by means of the retrocerebral pore.
2. (ROTIFERA)
A forked duct opening on the apical field, often on a single or paired papilla; part of the retrocerebral organ.

Online Dictionary of Invertebrate Zoology. . 2005.

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