What anatomical structure is not included in the Kernahan "striped Y" for cleft classification?

Name: What anatomical structure is not included in the Kernahan "striped Y" for cleft classification?
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The Kernahan "striped Y" for cleft classification includes the lip (one arm of the Y), hard palate and alveolus (other arm of the Y), and the area between alveolus and incisive foramen (stem of the Y). The posterior pharyngeal wall is not included in this classification system.

What Anatomical Structure Is Not Included in the Kernahan "Striped