MUSCLES. 



spines of the lower six thoracic and all the lumbar vertebrae 

 and the Erector spinae tendon; posterior part of iliac crest; 

 lower three or four ribs, by fleshy interdigitations with the 

 External oblique; (usually) lower angle of the scapula. 

 Course ; it ends in a narrow tendon which at first adheres to the 

 Teres major. Insertion; floor of bicipital groove of humerus, 

 behind the Coraco-brachialis and Biceps but in front of, and 

 separated by a bursa from, the Teres major. [319] 



Rhomboideus Minor. Origin; ligamentum nuchse; spines 

 of last cervical and first thoracic vertebrae. Insertion ; verte- 

 bral border of scapula, at base of its spine. [320] 



Rhomboideus Major.- Origin; spines and supraspinous 

 ligaments of second to fifth thoracic vertebrae. Insertion ; (up- 

 per part) vertebral border of scapula, through a membranous 

 band which is attached by its ends to the base of the spine 

 and the inferior angle, and is loosely connected with the border 

 between by areolar tissue; (lower fibres) inferior angle of 

 scapula. [321] 



Deep Muscles of Back. First Group. 



Serratus Posticus Superior. Origin; ligamentum nuchae; 

 spines of last cervical and upper three or four thoracic verte- 

 brae. Insertion; second to fifth ribs, by four slips. [392] 



Serratus Posticus Inferior. Origin; spines of lower two 

 thoracic and upper two lumbar vertebrae, through the verte- 

 bral aponeurosis. Insertion ; last four ribs, in four muscular 

 bands. [392] 



Second Group. 



Ilio-costalis (outer part of the Erector spinse). Insertion; 

 lower six ribs, by six slender slips; Accessorius (prolong- 

 ing the preceding). Origin; lower six ribs, internal to preced- 

 ing, by six slips. Insertion; upper six ribs, by similar slips. 

 Cervicalis Ascendens (prolonging the preceding). Origin; 

 upper six ribs, internal to the Accessorius. Insertion ; pos- 



[117] 



