Histological and Histochemical Study of the Trachea of Billy-Goat Capra Hircus During Different Ages

Abstract

The study's goal to define the trachea's characteristics in goats, was carried out on (5) as suckling kids and (5) as young kids. The trachea's wall is made up of muscle, adventitia, cartilage, submucosa, and mucosa, mucosa was lined by ciliated pseudostratified columnar epithelium contained (columnar, goblet and basal) cells, goblet cells were more than in thoracic trachea than that in cervical trachea, and young ages had higher percentage of goblet cells than suckling ages. Alveolar mucous glands and blood vessels made up the lamina propria-submucosa; there are several mucous simple alveolar glands in the cervical epithelium, mucous glands in the thoracic epithelium replaced by goblet cells. The cartilaginous rings were flattened, and perichondrium-enclosed. Dense fibroelastic tissue and smooth muscle joined the posterior ends of the cartilages, the ground substance and chondrocytes make up the cartilage that covered by  adventitia, muscle was made of smooth fibers and elastic fibers. The goblet cells had a mildly positive reactivity to Alcian blue with periodic acid, negative to Alcian blue, and positive to periodic acid Schiff.