932 



NEUROLOGY 



On the Scalenus anterior the phrenic nerve is joined by a branch from the fifth 

 cervical. 



Branches of Distribution. The branches of distribution of the brachial plexus 

 may be arranged into two groups, viz., those given off above and those below the 

 clavicle. 



SUPRACLAVICULAR BRANCHES. 



Dorsal scapular . . . 5 C. 



Suprascapular . . . 5, 6 C. 



Nerve to Subclavius . . . 5, 6 C. 



Long thoracic . . 5, 6, 7 C. 



To Longus colli and Scaleni 5, 6, 7, 8 C. 





MUSCULOCUTANEOUS 

 NERVE 



INTERCOSTO- HUMERAL 

 NERVES 



LONG SUBSCAPULAR 

 NERVE 



SUBSCAPULAF. 

 NERVES 



LATERAL CUTA- 

 NEOUS BRANCH 

 OF FOURTH 

 INTERCOSTAL 



LATERAL CUTANEOUS 



BRANCH OF 



THIRD INTERCOSTAL 



LONG THORACIC 

 NERVE 



FIG. 809. The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in 

 front. The Pectoralis major and minor muscles have been in large part removed; their attachments have been 

 reflected. (Spalteholz.) 



The Dorsal Scapular Nerve (n. dorsalis scapula; nerve to the Rhomboidei; posterior 

 scapular nerve) arises from the fifth cervical, pierces the Scalenus medius, passes 

 beneath the Levator scapulae, to which it occasionally gives a l!wig, and ends in 

 the Rhomboidei. 



The Suprascapular (n. suprascapularis) (Fig. 818) arises from the trunk formed 

 by the union of the fifth and sixth cervical nerves. It runs lateralward beneath 

 the Trapezius and the Omohyoideus, and enters the supraspinatous fossa through 

 the Suprascapular notch, below, the superior transverse scapular ligament; it then 

 passes beneath the Supraspinatus, and curves around the lateral border of the 

 spine of the scapula to the infraspmatous fossa. In the supraspinatous fossa it 

 gives off two branches to the Supraspinatus muscle, and an articular filament 

 to the shoulder-joint; and in the infraspinatous fossa it gives off t^vo branches 





