The lumen of the trachea is lined with pseudostratified ciliated columnar cells. Clear, mucous-secreting goblet cells can be seen interspersed in the epithelium (Ep). Cilia are visible on the luminal surface of the cells. The lamina propria (Lp) with elastic connective tissue underlies the epithelium. Mucous and seromucous glands (arrows) are in the submucosa (Sm). The tracheal ring (Tr) is composed of hyaline cartilage. The perichondrium (Pc) consisting of fibrous connective tissue surrounds the tracheal ring.
Terminal Bronchiole 100X
Branches of intrapulmonary bronchi called bronchioles supply air to pulmonary lobules of the lung. Observe that the cartilaginous plates and glands are absent. A circularly arranged band of smooth muscle (arrow) is present in the wall of the bronchiole. Simple ciliated columnar epithelium lines the lumen of the air passageway. A branch of the pulmonary artery (Bv) is present. Lung tissue with alveoli (AL) surrounds the bronchioles, but there is no gas exchange between the alveoli and the bronchioles.
Alveoli 100X
Polyhedral alveoli are present in the figure. Interalveolar septa (arrows) of varying degrees of thickness surround and separate alveolar air spaces. Darkly stained nuclei of simple squamous cells are visible in the walls of the alveoli.
OTHER IMAGES AVAILABLE WITH THE BOOK AND
CD-ROM
Nasal Region Rat Frontal Section 20X
Nasal Cavity Respiratory Mucosa 400X 1000X
Nasal Cavity Olfactory Mucosa 100X
Paranasal Sinus Frontal Section 40X
Epiglottis LS 20X 40X
Larynx Ventricular + Vocal Fold 20X
Trachea Inner Wall 400X
Trachea Goblet Cells 400X
Intrapulmonary Bronchus 40X 100X
Terminal Bronchiole 40X
Alveolar Capillaries 400X
Alveolar Epithelium 400X
