The<unk>  is the interface between the more apically located alveolar mucosa and the more coronally located attached gingiva of the gingiva.
There exists a<unk>  on all three gingival surfaces on which there exists freely moveable alveolar mucosa: the facial gingiva of the maxilla and both the facial and lingual gingiva of the mandible.  The palatal gingiva of the maxilla is continuous with the tissue of the palate, which is bound down to the palatal bones.  Because the palate is devoid of freely moveable alveolar mucosa, there is no<unk> .
Mucogingival junction
Hard palate
Buccal mucosa
Veratrum
Cauliflower ear
Hertwig's epithelial root sheath
Pharyngeal pouch 
Mucous membrane of nose