1993 Volume 1993 Issue Supplement68 Pages 51-57
The distribution of histochemical carbonic anhydrase (CA) activity was investigated in the trachea of a guinea pig. Activity was localized in the tracheal glands, and some epithelial cells and goblet cells in the mucosal epithelium. These cells were not observed in the upper trachea, but appeared in the middle or lower trachea as well as at the carina. The mucosal epithelial cells containing CA could be classified into four types according to their morphology; 1) cells showing long, slender cylindrical morphology (Type I ),2) cells showing bulging at the site corresponding to the nucleus and long, slender process pointing towards the epithelial surface (Type II ),3) cells which resembled Type II but had loop-like processes pointed towards the epithelial surface (Type M), and 4) cells with two types of processes (Type IV).
