A note on the quantitative anatomical study of the trachea in the Indian buffalo (Bubalus bubalis)

A quantitative study of the trachea in buffalo has been made. The trachea is found to be about 37.9 +/- 1.8 cm long. It weighs 219.8 +/- 34.08 gm and its capacity is 188.4 +/- 29.3 ml. Its length, weight and capacity appear to be significantly interrelated. The bronchus principalis dexter is found to be diverging at 23.5 degrees +/- 4.6 degrees angle, whereas the bronchus principalis sinister at 34.1 degrees +/- 8.4 degrees. Apart from the first tracheal ring, the trachea has the greatest outer transverse, outer vertical, inner transverse and inner vertical diameters from the fifth to the twentieth tracheal rings. Thereafter, these diameters gradually decrease upto the last tracheal ring, which has the shortest corresponding diameters. The vertical diameter is greater than the transverse diameter throughout the length of the trachea.