260 SURGICAL APPLIED ANATOMY, [u^p. xv. 



artery.* Towards the inner border of the wrist the 

 flexor carpi ulnaris tendon is evident, descending to 

 the pisiform bone. It is rendered most distinct when 

 the wrist is slightly flexed, and the little finger pressed 

 forcibly into the palm. In the hollow which this 

 posture produces between the last-named tendon and 

 the palrnaris longus lie the flexor sublimis tendons, and 

 just to the radial side of the flexor carpi ulnaris the 

 pulsations of the ulnar artery can be felt. Beneath 

 the thin skin in front of the wrist a part of the plexus 

 of veins can be seen that end in the median and 

 anterior ulnar trunks. 



At the back of the wrist the following tendons can 

 be readily distinguished from without inwards : the 

 extensor longus pollicis (extensor secundi internodii), 

 the extensor communis, and the extensor carpi ulnaris. 

 Of these, the most prominent is the first-named. It 

 is rendered most distinct when the thumb is forcibly 

 abducted and extended. The tendon leads up to a 

 small but prominent bony elevation on the back of 

 the radius that marks the outer border of the osseous 

 groove for its reception. This tendon, when it reaches 

 the radius, points to the centre of the posterior surface 

 of that bone, and indicates also roughly the position 

 of the interval between the scaphoid and semilunar 

 bones. The lower end of the ulna is very distinct. 

 When the hand is supine, its styloid process is exposed 

 at the inner and posterior aspect of the wrist to the 

 inner side of the extensor carpi ulnaris. In prona- 

 tion, however, the process is rendered less distinct, 

 while the head projects prominently, 011 the posterior 

 part of the wrist, and is found to lie between the 

 tendons of the extensor carpi ulnaris and extensor 

 minimi digiti. 



* Sometimes the superficialis volae arises higher and is larger 

 than usual. It then runs by the side of the radial in front of the 

 wrist, and, giving additional volume to the pulse, has been the 

 foundation of the so-called " double pulse." 



