SOCIETY OF THE UNIVERSITY OF ABERDEEN. 97 



the middle lobe to the inner surface of the eighth rib and upper sur- 

 face of the diaphragm, extending for about an inch and a half along 

 the eighth rib from the mid axillary line. 



The other fissure, which is the smaller, extends from the mid- 

 axillary line at the level of the sixth rib to the fourth chondro- 

 sternal articulation, when the lung is partially inflated. Both edges 

 of the fissure are completely enveloped in visceral pleura. 



(Signature of observer) ALEXANDER WILSON. 



Date of observation, November, 1905. 

 Sex, Male. 



Abnormal position of a right subclavian artery. 



On the right side of this subject the subclavian artery passes in 

 front of the scalenus anticus muscle instead of behind. From its 

 origin the artery runs upwards and outwards to about 3J cm. above 

 the first rib. It then turns downwards and outwards at an angle of 

 90, and passes in front of the scalenus anticus. 



The thyroid axis is given off at the highest part of the subclavian 

 artery, and a posterior scapular artery is given off' from the thyroid 

 axis near its origin and passes back between the upper and middle 

 cords of the brachial plexus. 



All the branches of the subclavian are given off to the inner 

 side of the scalenus anticus except the internal mammary, which has 

 its origin in front of the muscle. 



The phrenic nerve passes in front of the subclavian and posterior 

 scapular arteries. 



The insertion of the right scalenus anticus muscle is more pos- 

 terior than the left one, the former being 8J cm. and the latter 7 cm. 

 from the middle of the upper border of the sternum. 



(Signature of observer) ALFRED J. W. STEPHEN. 



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