422 



AJfGIOLOGY. 



HUMERAL ARTERY. 



(Fig. 162. 2.) 



The humeral artery, the continuation of the brachial, descends 

 obliquely backwards, along the inner side of the humerus ; just 

 above the elbow joint it divides into anterior and posterior radial 

 arteries, or more correctly speaking it gives off the former, and is 

 continued by the latter. Its principal branches are as follows : — 

 Anterior circumflex. I Cubital. 



Humeralis profunda. | Coraco-radial. 



Anterior radial. 



The Prehumeral or Anterior circumflex artery passes 

 between the two heads of the coraco-humeralis, reaches the front 

 'of the humerus, and terminates in the levator humeri, giving 

 twigs to the flexor brachii, coraco-humeralis, and the shoulder 

 joint, anastomosing with the posterior circumflex. 



The Arteria humeralis profunda arises near the conjoined 

 tendon of the latissimus dorsi and teres intemus, is divided into 

 two chief branches, which are distributed to the caput magnum 

 and medium, the anconeus, humeralis obliquus, and extensor 

 metacarpi magnus, anastomosing by one branch with the anterior 

 radial artery. 



The Cubital or Ulnar artery passes backwards beneath the 

 ficapulo-ulnaris, along the lower border of the middle head of the 

 triceps extensor, down the forearm, between the external and 

 middle flexors of the metacarpus, with the cubital nerve and vein, 

 inosculating at the knee with the recurrent branch of the posterior 

 radial artery, so forming the superior carpal arch. It gives off 

 branches, to the caput medium, scapulo-ulnaris, pectoralis trans- 

 versus, brachial fascia, and flexors of the leg ; also a nulrient 

 artery to the humerus, and twigs to the elbow joint, with a 

 small anterior subcutaneous branch 



The CoRACO-RADiAL artery, given off nearly opposite to the 

 last, passes forwards to the flexor brachii muscle, dividing into 

 ascending and descending branches. 



The Spiral or Anterior radial artery is given off at an 

 acute angle, just above the condyle of the humerus. It descends 

 over the anterior surface of the elbow joint, and beneath the 

 flexor muscles of the fore-arm and origin of the extensor meta- 

 carpi, where it meets the radial nerve. They travel together irt 



