47+ Transitional Zone Of Lip New Jersey. For example, the circle in the equator of the ocular lens in which epithelial fibers are developed into lens fibers, or the zone (anocutaneous line) that marks the junction of stratified squamous epithelium with columnar epithelium. Midline protrusion of the red zone of the upper lip.
The tz may be either wide or narrow depending on age, parity, prior infections and exposure to female hormones. Appears red because of underlying capillary bed. But the transition zone is more than esthetics.
Shulman, cara brigham gonzales, in prevention in clinical oral health care, 2008. A study of the transition zone using epithelial cell markers. Shallow midline v shaped depression extending from the base of the nose to the tubercle of the upper lip. This is an enlarged or thickened area found at the midline of the upper lip.
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