This features used as landmark for correct extension of the upper denture.

It is used as landmark for correct placement of artificial central incisor.

It is the landmark for posterior border extension of the upper denture.

Relief denture in this area to avoid pain and numbness of the lower lip.

The area under the nose.

It is a fold of mucous membrane that extends from the mucous membrane reflection area to the crest of the residual ridge.

It is the space distal to the buccal frenum. It is bounded externally by the cheek and internally by the residual ridge.

It is the extension of the posterior palatal border of the upper denture depends on the functional activity of the soft palate.

It is a fold of mucous membrane that extends from the floor of the mouth to the under surface of the tongue in the midline.