Ciliated Epithelium Histology Characteristics
Ciliated Epithelium is merely a variety of either columnar or cubical epithelium in which the free ends of the cells are beset with delicate hair-like processes, which execute lashing movements in some one direction.
It is found lining the trachea and bronchi, the cilia here serving to propel toward the larynx such particles of dust as are brought into the respiratory passages by the currents of air during respiration.
Ciliated epithelium also occurs on the lining membranes of the nose and the adjoining bony cavities, the mucous membrane of the uterus and the Fallopian tubes, the vasa efferentia of the testis and a part of the epididymus, the ventricles of the brain (except the fifth), the Mitral canal of the spinal cord, and the ducts of some glands.
The possession of cilia, which are very motile organs, presents a marked departure in specialization from the usual metabolic functions of epithelium. Ciliated epithelium rarely exercises a secretory function, its stock of energy being utilized to produce motion instead of chemical change. But there are secreting varieties of epithelium possessing a " cuticle " which appears to be morphologically anal ogous to the cilia, but in which the fibrils are less highly developed, probably not motile, and, therefore, functionally not the equiva.
Lents of cilia. This cuticle is highly developed in the cells covering the mucous membrane of the intestine. display_block('epithelium'); ?>