Abstract
The human utricular wall was studied with regard to the distribution of pigment. In general, the distribution of pigment of the superior wall was more dense than that of the inferior wall. The utricular macula and the hemispherical area of the anterolateral portion of the superior wall were devoid of pigment. Unlike the semicircular ducts, the membranous common crus demonstrated dense pigment distribution along the entire wall and less pigment toward the bifurcation of the anterior and posterior semicircular ducts. Masson-Fontana staining, a bleaching method, and elctron microscopic observation revealed the pigment to be melanin. Its significance is discussed from the viewpoint of laser inner ear surgery.
