retrocerebral sac

From ZooTerms (Dictionary of Invertebrate Zoology)
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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.