O: manubrium and medial 1/3 of clavicle

I: mastoid process (temporal) and lateral 1/2 of superior nuchal line (occipital)

A: lateral movement of neck and rotation of head

O: Spinous process C7-T4

I: sup. nuchal line + mastoid process

A: extension/hyperextension of head; secondarily contraction and flexion/rotation of head and neck

O: transverse process C1-C7

I: superior angle to medial border of scapula

A: Elevation of 1st Rib

levator scapulae

O: transverse process of C1-C4

I: superior angle to medial border of scapula

A: elevation of scapula 

digastric, stylohyoid, mylohyoid, hyoglossus

A: elevation of hyoid