Editing Shoulder (section)

===Other muscles===
'''Muscles from the shoulder region'''

In addition to the four muscles of the rotator cuff, the [[deltoid muscle]] and [[teres major muscle]]s arise and exist in the shoulder region itself.<ref name=":4" /> The deltoid muscle covers the shoulder joint on three sides, arising from the front upper third of the clavicle, the acromion, and the spine of the scapula, and travelling to insert on the deltoid tubercle of the humerus.<ref name=":4" /> Contraction of each part of the deltoid assists in different movements of the shoulder - flexion (clavicular part), abduction (middle part) and extension (scapular part).<ref name=":4" /> The teres major attaches to the outer part of the back of the scapula, beneath the teres minor, and attaches to the upper part of the humerus. It helps with medial rotation of the humerus.<ref name=":4" />

'''Muscles from the front'''

Muscles from the chest wall that contribute to the shoulder are:<ref name=":4" />

{| class="wikitable"
|-
| '''Name''' || '''Attachment''' || '''Function'''
|-
| [[serratus anterior]] || Originates on the surface of the upper eight [[ribs]] at the side of the chest and inserts along the entire anterior length of the medial border of the scapula.<ref name=":4" /> || It fixes the scapula into the thoracic wall and aids in rotation and abduction of the shoulders.{{citation needed|date=May 2015}}
|-
| [[subclavius]] || Located beneath the clavicle, originating from the [[first rib]] and inserting on the [[subclavian groove]] of the clavicle.<ref name=":4" />  || It depresses the lateral clavicle<ref name=":4" /> and also acts to stabilize the clavicle.{{citation needed|date=May 2015}}
|-
| [[pectoralis minor]]  || Arises from the third, fourth, and fifth ribs, near their cartilage and inserts into the medial border and upper surface of the [[coracoid process]] of the scapula.<ref name=":4" />   || This muscle aids in respiration, medially rotates the scapula, protracts the scapula, and also draws the scapula inferiorly.
|-
| [[sternocleidomastoid]]  || Attaches to the [[Human sternum|sternum]] (sterno-), the [[clavicle]] (cleido-), and the [[mastoid process]] of the [[temporal bone]] of the skull. || Most of its actions flex and rotate the head.  In regards to the shoulder, however, it also aids in respiration by elevating the sternoclavicular joint when the head is fixed.{{citation needed|date=May 2015}}
|-
| [[levator scapulae]] || Arises from the transverse processes of the first four [[cervical vertebrae]] and inserts into the [[medial border of the scapula]]. || It is capable of rotating the scapula downward and elevating the scapula.{{citation needed|date=May 2015}}
|}
'''Muscles from the back'''
{| class="wikitable"
|-
| [[rhomboid major]] and [[rhomboid minor]] (work together) || They arise from the [[spinous processes]] of the [[thoracic vertebrae]] T1 to T5 as well as from the spinous processes of the seventh cervical. They attach to the inner border of the scapula.<ref name=":4" />  || They are responsible for downward rotation of the scapula with the levator scapulae, as well as adduction of the scapula.
|-
| [[trapezius]]  || Arises from the [[occipital bone]], the [[ligamentum nuchae]], the spinous process of the seventh cervical, and the spinous processes of all the thoracic vertebrae.<ref name=":4" />  It attaches to the outer clavicle, the [[acromion process]], and into the [[spine of the scapula]].<ref name=":4" />  || Different portions of the fibers perform different actions on the scapula: depression, upward rotation, elevation, and retraction.<ref name=":4" />
|-
| [[levator scapulae]]
|Arises from the transverse processes of cervical vertebrae 1-4, and attaches to the upper part of the inner border of the scapula.<ref name=":4" />
|Elevates the scapula.<ref name=":4" />
|-
| [[latissimus dorsi]]
|A large muscle that arises from the spinous processes of the lower six thoracic vertebrae, lumbar and all sacral vertebrae, and posterior iliac crest. It attaches to the intertubercular groove of the humerus.<ref name=":4" />
|Adducts, extends and rotates the humerus inwards.<ref name=":4" />
|}