DISSECTING MANUAL. 



terior tubercles of fourth, fifth, and sixth cervical transverse 

 processes. [393] 



Longissimus Dorsi (inner part of the Erector spinae). In- 

 sertion; nearly all the ribs; transverse processes of the tho- 

 racic, and accessory processes of the upper lumbar, vertebrse. 

 Transversalis cervicis (prolonging the preceding). Origin; up- 

 per six thoracic transverse processes, internal to Longissimus 

 dorsi. Insertion; posterior tubercles of second to sixth cervical 

 transverse processes. Trachelo-mastoid (another prolonga- 

 tion). Origin; upper six thoracic transverse processes, with 

 preceding. Insertion; mastoid process. [393] 



Spinalis Dorsi. Origin; lower two thoracic and upper two 

 lumbar spines; Longissimus dorsi tendon. Course; close be- 

 side spines. Insertion ; upper thoracic spines. [395] 



Third Group. 



Semispinalis Dorsi. Origin; lower six thoracic transverse 

 processes. Insertion; spines of last two cervical and upper 

 four thoracic vertebrse. [395] 



Multifidus Spinae (Thoracic part).- Origin; transverse proc- 

 esses of thoracic vertebras. Course; in contact with laminae. 

 Insertion; vertebral spines. [395] 



Fourth Group. 



Rotatores Dorsi. There are eleven pairs of these muscles; 



each is a small slip. Origin ; transverse process of vertebra. 



Insertion ; lamina of vertebra next above. [397] 



Inter-spinales. Bands connecting the spines. [398] 



Inter-transversales. Slender slips between the transverse 



processes. [398] 



NERVES. 



Pneumogastric. From the neck both enter the thorax be- 

 hind the large veins, the left nerve between the subclavian and 

 common carotid arteries, the right after crossing over the sub- 



[118] 



