origin: superior borders of the angles of the 3rd to 6th ribs;
insertion: the posterior tubercles of the transverse processes of the
4th, 5th, and 6th cervical vertebrae;
action: acting bilaterally, extends and hyperextends the vertebral
column;
nerve supply: posterior rami of the spinal nerve,
C6 ,
C7 ,
C8 ;
synergists: splenius cervicis,
Semispinalis Cervicis
Longissimus Cervicis ;
