BRA.XCHES OF BRACHIAL 1' LEXISES 



Till 



this situation by the deep head of the iiiusele. It continues vertically di)\vn\vards 

 in the middle line of the forearm between the flexor sublimis and flexor profundus 

 digitorum; in this part of its course it is accompanied by a compani(jn artery, the 

 comes nervi mediani. At the upper border of the annular ligament it is ]ilaccd 

 between the tendons of the iiexor carpi radialis externally and the i)almaris longus 

 and flexor sublimis digitorum muscle internally. It passes under cover of the 

 anterior annular ligament, on the superficial surface of the Hexor tendons, and, at 

 the lower border of the ligament, it enlarges, and l)ifurcates into two terminal divi- 

 sions, an iimer larger, and an outer smaller. 



Branches. — The median nerve does not supply any jtart of the U])i)er arm. In 

 front of the ell)ow-joint it furnishes one or two filaments to tlu^ articuliition. In 



Fig. 457. — A Dissection siiowix(j the Akraxoemext of thjc Xekves ix kroxt 



(JK THE Elbow. 



(From a mounted specimen in the Anatomical Department of Trinity Colle<;e Dul)lin.) 



POSTERIOR BRANCH 



OF IXTKRXAL 



CVTAXEOUS SERVE 

 A XTERIOR BRA NCH 



OF IXTFRXAL 



rCTAXEOVS NERVE 



Brachial artery 



BRANCH TO 

 PRONATOR TERES 



Bicipital fascia, cut abort 



Pronator radii teres 

 muscle 



MEDIAN NERVE 



Ulnar arlerv 



Biceps muscle 



. BRANCH OF MUSCUHt- 



SPIRAL XERVE TO 

 sr FIXATOR LONGUS 



— RADIAL NERVE 



Radial recurrent artery 

 n,„l POSTERIOR 

 — I XTFR OSSEOUS 

 XFi; VE 



Tendon of biceps 



MTSfUL O-CUTA XEO US 

 XER VE 



Supinator longus muscle 



Railial artery 



the forearm it supplies all the superficial anterior muscles (with the exception of 

 the flexor carpi ulnaris) directly from its trunk, and supplies the deep muscles 

 (with the exception of the inner half of the flexor profundus) by its anterior inter- 

 osseous branch. In the hand it sup])lies the group of short muscles of the thumb 

 (with the exception of those whicli are ])laced on the ulnar side of the tendon of 

 the flexor longus pollicis), the two outer lumbricales, the integument covering the 

 central part of the palm and inner part of the tln-nar eminence, and th(^ palmar 

 aspect of the thumb, index, middle, and radial half of the ring fingers. It also 

 sends tAvigs to the dorsal as])ect of these digits. 



(a) The nerve to the pronator radii teres arises a little above the bcnil of 

 the elbow, and pierces the outer border of that muscle. 



