SECTION XV 

 BRACHIAL PLEXUS AND NERVES OF UPPER LIMB 



THE Braehial Plexus is formed by the anterior division of the 

 fifth, sixth, seventh, and eighth cervical nerves, and the greater 

 part of the first thoracic nerve. The second thoracic nerve, 



To Cervical Plexus 

 To Braehial Plexus, 



Third Root of Phrenic (inconstant) 

 Nerve to the Rhomboids 

 Nerve to Subclavius 



' **/* *a\,Ajt/uiai. 



^ 



External Anterior Thoracic 



Circumflex 

 Musculo-spiral \ 

 Outer Root of Median 



Musculo-cutaneous 



Median 



* Posterior Thoracic (Ext. 

 Respiratory N. of Bell). 

 First Intercostal 



\ 



\ " Upper or Short Subscapular 

 \ 'Internal Anterior Thoracic 

 \ Middle or Long Subscapular 

 \ \ Lower Subscapular 



X N Nerve of Wrisberg 



N Inner Root of Median 

 Internal Cutaneous 



Ulnar 



FIG. 65. THE BRACHIAL PLEXUS. 



although not part of the plexus, helps in the innervation of the 

 arm through the intercosto-humeral nerve. 



The nerves forming the plexus appear in the posterior triangle 



184 



