Nervous system often imbedded in the epidermis.
Among the Archiannelida, in Aeolosoma and some Polychaetes, the whole central nervous system remains imbedded in the epidermis.
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A well-developed cellular parenchyma forms a matrix in which the muscular, excretory and generative organs are imbedded.
The body, or " strobila," consists of a usually minute organ of attachment (scolex or its representative) which is imbedded in the intestinal membrane, and of a series of segments that arise from the base of the scolex and increase in size distally.