98 



PRACTICAL MICROSCOPY. 



leads to such a group.) (c) The number of nuclei, indicating the 

 presence of more than a single layer of cells. 



2. The mucosa. (a) Deeply stained blue nuclei of the adenoid 

 tissue just beneath the epithelium, (b) Pink portion of the region 

 below the adenoid tissue. (The longitudinal elastic fibres cut trans- 

 versely.) (c) Blood-vessels. 



3. The muscular coat, (a) Apparent solution of continuity in 

 places caused by tubes of mucous glands. (5) The absence of 

 large vessels in this coat. 



FIG. 71. TRANSVERSE SECTION OF PART OF THE WALL OF A LARGE BRONCHUS. 

 Lung of Pig. Stained with Haema. and Eosin. X 60. 



E. Epithelial lining. The line from the letter leads to a part of the lining containing large 

 mucous cells. 



I. The internal fibrous coat. 

 M. Muscular coat. 



C. Cartilage plates of external fibrous coat. 



A. Bronchial artery The pulmonary artery is not included. 



V. Bronchial vein. 



N. Nerve trunk. 



G. Mucous glands. 



D. Obliquely sectioned duct. 



