THE HEAD AND NECK, POSTERIOR. 135 



Semispinalis Colli. Fig. 76. 



Origin. From the transverse processes of the five or six 

 upper dorsal vertebrae. 



Insertion. Into the spinous processes of the second to 

 the sixth cervical vertebrae. 



Nerve Supply. The internal branches of the posterior 

 divisions of the lower cervical nerves. 



Action. Both acting, they extend the cervical vertebrae. 

 One acting, extends, and rotates the neck to the opposite 

 side. 



Transversalis Colli. Fig. 76. 



Origin. From the transverse processes of the five or 

 six upper dorsal vertebrae. 



Insertion. Into the posterior tubercles of the transverse 

 processes of the cervical vertebrae from the second to the 

 sixth. 



Nerve Supply. The external branches of the posterior 

 divisions of the lower cervical and upper dorsal nerves. 



Action. Both, extend the neck ; one, rotate the cervical 

 vertebrae to the same side and flex them laterally. 



Cervicalis Ascendens. Fig. 76. 



Origin. From the four or five upper ribs near their 

 angles. 



Insertion. Into the transverse processes of the fourth, 

 fifth, and sixth cervical vertebrae. 



Nerve Supply. The external branches of the posterior 

 divisions of the lower cervical and upper dorsal nerves. 



Action. To extend the lower cervical vertebrae, to raise 

 the ribs, and so aid inspiration ; one acting, to flex the 

 lower cervical vertebrae laterally. 



The Deep Cervical Artery (Profunda Cervicis). See page 

 1 13 for source. 



