236 SURGICAL APPLIED ANATOMY. [Chap. 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 palmaris 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 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 promi- 

 nent 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 on 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 volse 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." 



