180 MYOLOGY, OR ANATOMY OF MUSCULAR SYSTEM 



spines, posterior fifth of inner lip of the iliac crest, lower and 

 back part of the sacrum, anterior surface of the lumbar fascia; 

 opposite the last rib this mass divides into the middle and 

 outer columns, and an inner one, spinalis dorsi, separates 

 from the middle in the upper dorsal region. The outer and 

 middle portions subdivide. 



I 



(a) Middle column. (6) Outer column. 



Longissimus dorsi (Longissi- Sacrolumbalis (Iliocostalis 

 mus dorsi, p. n.). lumborum, p. n.). 



Transversalis cervicis (Longis- Museums Accessorius (Ilio- 

 simus cervicis, p. n.). costalis dorsi, p. n.). 



Trachelomastoid (Longissimus Cervicalis ascendens (Ilio- 

 capitis, p. n.). costalis cervicis, p. n.). 



(c) Inner column. 

 Spinalis dorsi. Spinalis colli or cervicis. 



II 



Complexus. 



M. iliocostalis lumborum (sacrolumbalis) from the outer 

 and superficial portion of the common mass into the angles 

 of the lower six or seven ribs. 



M. iliocostalis dorsi (accessorius), from ribs into which the 

 preceding is inserted, but internal to it, into the angles of the 

 upper six ribs and transverse process of the seventh cervical 

 vertebra. 



M. iliocostalis cervicis (cervicalis ascendens) continues the 

 series from the angles of the upper four or five ribs into the 

 posterior tubercles of the fourth, fifth, and sixth cervical trans- 

 verse processes. 



M. longissimus dorsi rises from the common mass, has two 

 sets of insertions the inner row of round tendons into all the 

 dorsal transverse processes and lumbar accessory processes; an 

 outer row to the lowest nine or ten ribs between the angles and 

 tuberosities, and to the whole length of the lumbar transverse 

 processes and into the lumbar fascia. 



M. longissimus ccrvicis (transversalis cervicis), from the 

 highest four or five dorsal transverse processes into posterior 



