weer sat” 
THE RADIAL ARTERY. 787 
forwards through the first interosseous space to the palm of the hand, where it 
joins the deep branch of the ulnar artery. 
Relations of the first part.—Posterior.—It passes successively in front of the 
following structures: the tendon of 
insertion of the biceps, the supinator 
brevis, the pronator radii teres, the 
radial portion of the flexor sublimis 
digitorum, the flexor longus pollicis, the Brachial artery 
pronator quadratus, and the anterior 
Biceps 
ligament of the wrist-joint. Anterior.— Medianiarence 
The artery is overlapped in the upper 
half by the anterior border of the Muscitlo-spital 
supinator longus; in the remainder of Rial recurfent 
its extent it is covered only by skin and Brachialis 
fascia. Lateral.—To the outer side is SuHEOS 
Supinator 
the supinator longus and the radial longus 
nerve. This latter lies quite near to gupinator brevis Ulnar 
artery 
the artery in its middle third. To the Radial recurfent 
inner side is the pronator radii teres ee 
above and the flexor carpi radialis below. 
Two vena comites, one on each side, 
accompany the artery. 
Branches of the first part.— 
(1) The radial recurrent (a. recurrens 
radialis) arises in the ante-cubital fossa. 
It springs from the outer side of the 
radial in front of the supinator brevis. Flexor sublimis 
It runs outwards, passes between the th 
radial and posterior interosseous nerves, 
and then ascends to the external condyle 
of the humerus, where it anastomoses 
with the anterior terminal branch of 
the superior profunda. The radial re- 
current supplies numerous muscular prexor longus pollicis 
branches to the supinator longus, the 
supinator brevis, the extensor carpi 
radialis longior, and the extensor carpi 
radialis brevior. 
(2) Muscular branches (rami Superficialis vole } 
musculares) to the muscles on the 
radial side of the anterior aspect of the 
forearm. 
(3) The superficialis vole (ramus 
volaris superficialis, Fig. 563) is a 
slender vessel which arises a_ short 
distance above the wrist and runs down- 
wards across the ball of the thumb. It 
usually pierces the superficial muscles Radialis indicis 
of the thenar eminence, and terminates a 
either in their substance or by uniting 
with the ulnar artery and completing 
the superficial palmar arch of the 
hand. 
(4) An anterior radial carpal branch 
(ramus carpeus volaris) passes inwards 
beneath the flexor tendons and_ their 
Supinator brevis 
Pronator 
teres 
Radial artery 
Ulnar artery 
Flexor carpi 
radialis 
Ulnar nerve 
Palmaris 
longus 
Comes nervi 
mediani artery 
Deep branch 
of ulnar artery 
Superficial 
palmar arch 
Digital 
arteries 
° . ‘Ta. 563.—S 7 a ni 7 + , 
synovial sheaths, and crosses the anterior Fic. 563.—SuPERFIcIAL DISSECTION OF THE FRONT OF 
THE FOREARM AND HAND, showing the radial and 
carpal ligaments. It anastomoses with ulnar arteries and the superficial palmar arch with its 
the anterior carpal branch of the ulnar branches. 
artery to form the anterior carpal arch, 
and it receives communications from the anterior interosseous artery and from the deep 
palmar arch. 
“9 
