226 ANATOMY AND PHYSIOLOGY FOR NURSES 



cervical ganglia of the sympathetic. At the neck it gives 

 off the following branches, which are distributed to the 

 several regions that each name designates. 



Thoracic region. Scapular region. 



Anterior thoracic. Superior muscular. 



Posterior thoracic. Suprascapular. 



Subscapular. 



Brachial region. 



Musculocutaneous. Ulnar. 



Median. Lesser internal cutaneous. 



Internal cutaneous. Musculospiral. 



Circumflex. 



The Dorsal Nerves. These are twelve in number, and 

 correspond to the dorsal vertebrae; they supply the several 

 muscles of the chest and side. 



The intercostals are formed from the dorsal and supply 

 the intercostal spaces, pleura, mammary vessels, the 

 muscles of the chest and side of the throat; the six lower 

 supply the internal oblique and transversalis muscles, and 

 continue to the sheath of the rectus; after supplying this 

 muscle they go on to the linea alba, and, diverging, form 

 the anterior cutaneous nerves of the abdomen. 



The lumbar nerves are five in number on each side. 

 The anterior branches of the four upper nerves anasto- 

 mose to form the lumbar plexus. The plexus sends off 

 the following branches : 



The Iliohypo gastric Branch. This proceeds from the 

 first lumbar nerve, and supplies the muscles of the hip 

 and abdomen; it is distributed to the iliac region from 

 the iliac branch; to the internal abdominal ring from the 

 hypo gastric branch. 



The ilio-inguinal nerve arises from the first lumbar, and 

 supplies the external abdominal ring, the pudenda, sper- 



