SHOULDER, ARM, FOREARM, AND HAND. 173 



1. Roof, formed by skin and fasciae superficial and deep. 



2. Floor, formed by flexor longus pollicis and pronator quadratus. 



3. Outer border, formed by supinator longus or brachio-radialis muscle. 



4. Inner border, formed by the flexor carpi radialis and pronator radii teres. 



5. Contents, consisting of the radial artery and its venae comites. 

 The ulnar groove has these geometrical parts : 



1 . Roof, formed by the skin and fasciae, superficial and deep. 



2. Floor, formed by the flexor profundus digitorum muscle. 



MEDIAN NERVE 



Posterior branch of 



anastomotica magna 



BRANCHES OF ( 



INTERNAL CUTA-J. 



NEOUS NERVE (_ 



Posterior ulnar vein 



Brachialis anticus 



Anterior branch of 

 anastomotica magna 

 Anterior ulnar ruin 



Median basilic vein 



MUSCULAR BRANCH 

 OF MEDIAN NER VE 



Tendon of biceps 

 Bieipital fascia 



Erachialis anticus 



Deep median vein 



Ulnar artery 



Pronator teres 



Radial artery 



Biceps 



Internal vena 

 comes of 

 brachial artery 

 Basilic vein 



Brachialis 

 anticus 



Cephalic vein 



Brachial artery 

 EXTERNAL 



CUTANEOUS 



NER VE 

 Musculo-spiral 

 n. and ascending 

 branch of radial 

 recurrent artery 

 Radial vein 

 Median cephalic 



vein 



Ascending br. of 

 radial recurrent 

 RADIAL 



NERVE 

 Radial recurrent 



artery 

 Supinator 

 ' longus 



Descending br. 



of radial 



recurrent 

 Median vein 



RADIAL 

 NERVE 



FIG. 118. THE BEND OF THE EI.HUW WITH THE SUPERFICIAL VEINS. 

 (From a dissection by Dr. Alder Smith in the Museum of St. Bartholomew's Hospital.) 



3. Outer border, formed by the flexor sublimis digitorum muscle. 



4. Inner border, formed by the flexor carpi ulnaris muscle. 



5. Contents, which are : ulnar artery, vena? comites, and ulnar nerve. 

 Dissection (Fig. 117). The Radial Artery. Cut through the roof of the 



groove. Then, with your scissors and forceps or director, follow the artery up 

 to the bifurcation of tlic brachial artery. Observe the numerous small muscular 

 branches that are given off by this artery both to muscles and skin. 



The Ulnar Artery. Cut through the roof of its groove and follow it up as 

 far as you can without cutting into the flexor sublimis digitorum muscle. Note 



