370 RESPIRATION. 



Nerve-supply. Middle or long subscapular nerve. 



Rhomboideus Minor. It arises from the ligamentum nuchae 

 and spinous processes of the seventh cervical and first dorsal 

 vertebrae, and is inserted into the scapula at the root of the spine. 



Nerve-supply. The anterior division of the fifth cervical 

 nerve. , 



Rhomboideus Major. This arises from the spinotis processes 

 of the 4 or 5 upper dorsal vertebrae and the supraspinous ligament, 

 and is inserted into the tendinous arch extending from the scapula 

 at the root of its spine to its inferior angle. 



Nerve-supply. The anterior division of the fifth cervical nerve. 



Serratus Posticus Superior. This muscle arises from the liga- 

 mentum nuchae and the spinous processes of the seventh cervical 

 and 2 or 3 upper dorsal vertebrae and the supraspinous ligament, 

 and is inserted into the second, third, fourth, and fifth ribs beyond 

 their angles. 



Nerve-supply. The external branches of the posterior divisions 

 of the upper dorsal nerve. 



Serratus Posticus Inferior. It arises from the spinous processes 

 of the eleventh and twelfth dorsal and the 2 or 3 upper lumbar 

 vertebrae and supraspinous ligament, and is inserted into the four 

 lower ribs beyond their angles. 



Nerve-supply. The external branches of the posterior division 

 of the lower dorsal nerves. 



lliocostalis. This is sometimes called sacrolumbalis. It is the 

 outer part of the erector spinae which arises from the sacro-iliae 

 groove, and forms a broad tendon attached to the sacrum, lumbar 

 vertebrae, supraspinous ligament, and that of the ilium and the 

 sacrum. It is inserted into the angles of the 6 or 7 lower ribs. 



Nerve-supply comes through the external branches of the pos- 

 terior divisions of the lumbar and dorsal nerves. 



Quadratus iMmborum. It arises from the iliolumbar ligament 

 and the crest of the ilium, and is inserted into the last rib and 

 the transverse processes of the 4 upper lumbar vertebrae. 



Nerve-supply. The anterior branches of the lumbar nerves. 



Sternomastoid. It arises from the sternum and clavicle, and 

 is inserted into the mastoid process of the temporal bone and the 

 occipital bone. 



Nervous Supply. The spinal accessory and deep branches of 

 the cervical plexus. 



Pectoralis Major. It arises from the clavicle, sternum, carti- 

 lage of the true ribs, aponeurosis of the obliquus externus, and is 

 inserted into the anterior bicipital ridge of the humerus. 



Nervous Supply. The anterior thoracic nerve. 



Pectoralis Minor. It arises from the third, fourth, and fifth 

 ribs, and from the aponeurosis covering the intercostal muscles, 

 and is inserted into the coracoid process of the scapula. 



