Also found in: Encyclopedia.
dark spots or bar's (depending on the plane of section) in the lateral boundary between the apical ends of columnar epithelial cells; this region corresponds with the area of the junctional complex and the thin filaments that anchor on the zonula adherens.
The portion of the cell below and perpendicular to the cilia seen in pap-stained smears of ciliated columnar cells, which corresponds to the belt desmosomes, actin filaments and other proteins aggregated at the apical end of the cells.
Terminal bars occur in the normal respiratory epithelium, and in tubal metaplasia of the uterine cervix.
Terminal bar-like structures have been described in adenomas, adenocarcinoma, transitional and papillary carcinoma of the urinary bladder, synovial sarcomas and mesotheliomas.
ter·mi·nal bar(tĕr'mi-năl bahr)
Dark spots or bars (depending on the plane of section) in the lateral boundary between the apical ends of columnar epithelial cells.