The<unk>  is that epithelium which lies at, and in health also defines, the base of the gingival sulcus. It attaches to the surface of the tooth with hemidesmosomes and is, on average, roughly 1 mm in width, constituting about one half of the biologic width.
The<unk>  lies immediately apical to the sulcular epithelium, which lines the gingival sulcus from the base to the free gingival margin, where it interfaces with the epithelium of the oral cavity.
Cells in the<unk>  tend to have wide inter-cellular spaces, to allow the transmission of white blood cells from blood vessels  to bottom of the gingival sulcus, to help prevent disease.  Damage to the<unk>  results in it being irregular in texture, rather than smooth, and the formation of "pocket" epithelium, which is a primary symptom of gum disease.
Junctional epithelium
Epithelium
Respiratory epithelium
Mesenteric glands
Interstitial cell of Cajal
Venule
Inner cell mass
Adnexa