ACCESSORY MUSCLES OF NECK
Muscle: sternocleidomastoid
Origin: mastoid process of temporal bone
Insertion: sternal head: superior manubrium
sterni
clavicular head: superior surface
of clavicle
Function: elevates sternum and by
association, rib cage
, Muscle: scalenus anterior
Origin: transverse processes of vertebrae C3-
C6
Insertion: superior surface of rib 1
Function: elevates rib 1
Muscle: scalenus medius
Origin: transverse processes of vertebrae C2-
C7
Insertion: superior surface of the first rib
Function: elevates rib 1
Muscle: scalenus posterior
Origin: transverse processes of C5-C7
Insertion: second rib
Function: elevates rib 2
Muscle: sternocleidomastoid
Origin: mastoid process of temporal bone
Insertion: sternal head: superior manubrium
sterni
clavicular head: superior surface
of clavicle
Function: elevates sternum and by
association, rib cage
, Muscle: scalenus anterior
Origin: transverse processes of vertebrae C3-
C6
Insertion: superior surface of rib 1
Function: elevates rib 1
Muscle: scalenus medius
Origin: transverse processes of vertebrae C2-
C7
Insertion: superior surface of the first rib
Function: elevates rib 1
Muscle: scalenus posterior
Origin: transverse processes of C5-C7
Insertion: second rib
Function: elevates rib 2