AXILLARY SPACE 



39 



clavicular joint there are the lower fibres of the sterno-hyoid 

 and sterno-thyreoid muscles which intervene, on the right side, 

 between the capsule of the joint and the bifurcation of the 

 innominate artery into its right common carotid and subclavian 

 branches, and, on the left side, between the joint and the left 

 common carotid artery. 



Plexus Brachialis (Brachial Plexus). This important 



Subscapular nerve j 

 Ulnar nerve 



Lateral cutaneous nerve 

 | Lateral cutaneous nerve 

 j Intercosto-brachial nerve 



| Medial cutaneous nerve of arm 

 Medial cutaneous nerve of forearm 



FIG. 19. Diagram of Brachial Plexus and its Branches. 



plexus is formed by the anterior rami of the lower four 

 cervical nerves and the greater part of the anterior 

 ramus of the first thoracic nerve. The plexus is further 

 reinforced, above, by a small twig of communication which 

 passes from the fourth to the fifth cervical nerve, whilst, below, 

 a similar connecting twig not infrequently passes upwards, in 

 front of the neck of the second rib, from the second to 



