406 



ARTERIES OF THE UPPER LIMB. 



Fig. 266. 



the position of one or both the vessels may 

 be subject to very considerable variation in 

 different instances ; and in some of these, 

 while one of the vessels is near tlie usual 

 position, the other may be at some distance, 

 as for example when it is bound down to 

 the inner condylar line of the humerus. 



Fi^,'. 266.— Dehp ANTERion View of tue Ar- 



TEKIES OF THE A KM, FoRE-AR:iI, AND IIaND 



(from TieJemaim). 5 



The biceps brachii, tlie pronator teres and mus- 

 cles rising from the inner condyle, the supinator 

 longus, the lower part of tlie flexor longuspollicis 

 and flexor jn-ofundus digitorum, tlie anterior an- 

 nular ligament of the carpus and the muscles of 

 tlie ball of the thumb, have been removed ; 11, 

 jn-onator quadratus muscle ; 1, lower part of the 

 axillary artery continued into the brachial ; 2, 

 superior profunda branch ; 3, inferior profunda ; 

 4, anastomotic ; 5, upper part of the radial 

 artery and radial recurrent ; [>', lower part of the 

 radial artery giving olf the supcrficialis voice 

 branch ; 5", the radial artery emerging from be- 

 tween the heads of the abductor indicis muscle ; 

 (), 6, the upper part of the ulnar artery with the 

 anterior and iwstcrior ulnar recun-ent branches ; 

 G', the ulnar artery approaching the wrist and 

 descending into the superficial palmar arch which 

 Las been cut short ; 6", the deep branch of the 

 ulnar artery uniting with the deep palmar arch ; 

 7 ^marked only on one), three interosseous branches 

 from the deep palmar arch joining the palmar 

 digital arteries 8, 8, 8, which have been cut 

 away from their origin from the superficial arch 

 to near their division into the collateral digital 

 arteries ; the ulnar collateral of the little finger 

 is represented as rising in this instance from the 

 deep ulnar artery ; 9, x^laccd between the prin- 

 ceps pollicis and radialis indicis branches of the 

 radial artery ; 10, lower part of the anterior 

 interosseous artery passing behind the pronator 

 quadratus muscle ; 11, anastomosis of the an- 

 terior carpal branches of the radial and ulnar 

 arteries with i-ecurrent branches from the deep 

 pa'.mar arch. 



rt 



At the bend of the ann the brachial arteiy 

 is exposed to the risk of injury from the 

 -(j" operation of venesection, for which the 



median basilic vein is most commonly selected. 

 This vein lies often exactly in front of the 

 artery, the semilunar fascia being stretched 

 between them. Instances are on record in 

 v.'hich the artery has been wounded by the 

 lancet transfixing the vein and fascia, and a 

 communication has thus been established be- 

 tween the vein and arterj'. On this account 

 the incision into the vein must be made with 

 due care, and indeed the median cephalic, if 

 of sufficient size, may be selected for 

 venesection. 



