256 Messrs. L. Hill, J. M. McQueen, and W. W. Ingram. 



of the thumb, till it dips between the interossei muscles in the first inter - 

 osseus space to join the deep carpal arch. The brachial artery in the arm 

 and the radial artery in the forearm are divided by us into certain positions. 



Position I (radial artery) denotes the part of the artery on the back of the 

 hand that can be covered by the bag of the L. Hill sphygmometer while 

 space is left for pulse observation distal to it. 



Position II (radial artery) denotes that part of the artery which can be 



covered by the bag as it curves from the dorsal surface to the palmar surface 

 of the forearm. 



Position III (radial artery) denotes the superficial course of the radial 

 artery in the forearm just previous to its dipping deep between the supinator 

 longus muscle and the pronator radii teres. 



Position IV (brachial artery) denotes that part of the brachial artery that 

 lies superficially in the antecubital fossa. 



In position I the artery lies superficially under the skin,, and is placed 

 upon an unyielding bed of bone, the carpal bones, their ligaments and 

 the tendons of extensor muscles. Such an observational site may well be 

 taken as a standard, in the light of which all other positions may be 

 reviewed. The bag of the pocket syhygmometer applied on the artery at 

 position I cannot fail to transmit pressure equally to all parts of the artery 



Position W 

 v 5 



