preoral

[ pree-awr-uhl, -ohr- ]

Phonetic (Standard)IPA

adjective

, Zoology.

Origin of preoral¹

First recorded in 1865–70; pre- + oral

The cilia of the preoral and postoral bands are not clearly differentiated at this stage.

At the anterior end of the preoral lobe is a nervous thickening of the ectoderm called 226 the apical plate .

Prostomium: The region in front of the mouth; the preoral part of the head.

To the right of this adoral zone is a single line of preoral cilia.

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