SOCIETY OF THE UNIVERSITY OF ABERDEEN. 37 



arises from the middle of the inner border of the biceps, and passing 

 down and in, is applied to the outer border of the semitendinosus. 

 Opposite the popliteal space, it sends a fascial process to the deep 

 fascia there. It then ends in a round slender tendon, which is inserted 

 into the inner head of the gastrocnemius about a quarter of an inch 

 above the commencement of the tendo Achillis. 



(Signature of observer) J. ELDER. 



Date of observation, February, 1905. 

 Sex, Male. 



Cervical ribs. 



The left rib articulates with the seventh cervical vertebra behind, 

 passing downwards and forwards to articulate with the first rib proper, 

 just behind the groove for the subclavian vein. The groove for the 

 artery is absent, owing to the latter passing over the articulation. It 

 is placed so as to have superior and inferior borders, and internal 

 and external surfaces. It measures 6'2 cm. in length, and 7 "5 mm. 

 in width at the centre but expands at the ends. These measurements 

 differ slightly from those of the right side. Following the curvature 

 of the first rib, the anterior articulation is about 12 cm. from the 

 centre of the suprasternal notch. The rib has practically no cur- 

 vature. 



The relations are as follows : arching from within outwards 

 over the superior border, and in order from before backwards are 

 the subclavian artery which crosses the articulation, the supra- 

 scapular artery and the cords of the brachial plexus. 



The phrenic nerve is separated from it by the cords of the plexus, 

 while the transversalis colli artery is separated from it by the scalenus 

 anticus muscle. The latter muscle is internal to the rib, and is just 

 in apposition with it at its lower and inner end. The subclavian vein 

 crosses the first rib in front of the articulation. 



Internally pleura is attached to the lower half of the inner sur- 

 face. Externally the rib is covered on its outer surface by the fibres of 



