Histology and ultrastructure of larynx in the bactrian camel (Camelus bactrianus).

摘要

The light, scanning (SEM) and transmission electron microscopies (TEM) were used to observe the histology and ultrastructure of the larynx in the bactrian camel (Camelus bactrianus). The larynx contained five constituent cartilages, epiglottis, thyroid, cricoid and paired arytenoids. The mucous epithelium varied at different locations of the larynx, the epithelial layers of the vocal cord, arytenoid cartilage and the epiglottis (Atrium glottides) were composed of squamous epithelium while the other area were covered with pseudostratified ciliated columnar epithelium. Submucosal glands were tubuloalveolar with mucous (acidic and neutral) secretions. SEM revealed that most of mucosal glands had a cover on its opening, thus the openings were half-covered. TEM showed the tight junction of the epithelial cells and scattered lymphocytes and granulocytes in the epithelium. The larynx-associated lymphoid tissue (LALT) was also observed in the epithelium, some of which exhibited as typical lymphoid follicles, and others as aggregating lymphocytes.