274 ANATOMY IN A NUTSHELL. 



Insertion. — Into the inferior borders of the angles of the six or seven 

 Lower ribs. It sometimes may include all the ribs. 



Action. — To draw down the chest and spine. 



Musculus accessorius ad ilio-costalom (ad sacro-lumbalem.) — Description. 

 —This muscle is narrow with a serrated margin on each side. It takes its name 

 from being an accessory to the Ilio-costalis. 



Ork;ix. — From the upper borders of the angles of the six lower ribs by 

 separate tendons. 



Insertion. — (1) Upper borders of the angles of the six upper ribs, (2) 

 back of transverse process of the seventh cervical vertebra. 



Action. — To assist the Erector spina 3 . 



Longissimus dorsi. — Description. — This muscle takes its name from its 

 length and position. 



Origin. — (1) From the middle part of the Erector spina?, (2) transverse 

 processes of the lumbar vertebra*, (3) middle lamina of lumbar fascia. 



Insertion. — (1) Tips of transverse processes of all the dorsal vertebras, 

 (2) between the tubercles and angles of the lower ribs (seventh to eleventh.) 



Action. — To draw down the chest and spine. 



Spinalis dorsi. — Description. — This muscle takes its name from its at- 

 tachment to the spines in the dorsal region. 



Origin. — From spinous processes of eleventh and twelfth dorsal and first 

 and second lumbar vertebra?. 



Insertion. — Into the spinous processes of the six or eight upper dorsal 

 vertebra 1 . 



Action. — To extend the dorsal region of the spine. 



Cervicalis ascendens. — Description. — This muscle takes its name from its 

 position and direction. 



Origin. — From angles of the four or five upper ribs. 



Insertion. — Posterior tubercles of transverse processes of fourth, fifth 

 and sixth cervical vertebrae. 



Action. — Elevates the ribs, if the cervical vertebrae are the fixed point. It 

 extends the neck, if the ribs are the fixed point. If only one acts it pulls the 

 neck to its own side. 



Transversalis colli (cervicis.) — Description. — This muscle takes its name 

 from its attachment to the transverse processes, and its insertion in the neck. 



Origin. — From upper portion of transverse processes of six upper dorsal 

 vertebrae. 



Insertion.— Posterior tubercles of transverse processes of the second to 

 the sixth cervical vertebrae (inclusive.) 



Action. — If both ad, and the fixed point is below, they extend the neck 

 backward. 



Trachelo-mastoid. — DESCRIPTION. — This muscle takes its name from its 

 origin and its insertion. 



Origin. — (1) Transverse processes of first five or six dorsal vertebrae, (2) 

 articular processes of the three or four lower cervical vertebra?. 



Insertion.- Posterior margin of mastoid process of temporal bone be- 



