Editing Upper limb (section)

====Shoulder girdle====
[[File:Pectoral girdle front diagram.svg|thumb|Bones of the shoulder girdle]]
{{Main|Shoulder girdle}}
The shoulder girdle<ref name="Thieme-Atlas-208">{{harvnb|Ross|Lamperti|2006| p=208}}</ref> or pectoral girdle,<ref name="Sellers-1">{{harvnb|Sellers|2002| pp=1–3}}</ref> composed of the [[clavicle]] and the [[scapula]], connects the upper limb to the [[axial skeleton]] through the [[sternoclavicular joint]] (the only joint in the upper limb that directly articulates with the trunk), a ball and socket joint supported by the [[subclavius muscle]] which acts as a dynamic [[ligament]].  While this muscle prevents dislocation in the joint, strong forces tend to break the clavicle instead.  The [[acromioclavicular joint]], the joint between the [[acromion]] process on the scapula and the clavicle, is similarly strengthened by strong ligaments, especially the [[coracoclavicular ligament]] which prevents excessive lateral and medial movements.  Between them these two joints allow a wide range of movements for the shoulder girdle, much because of the lack of a bone-to-bone contact between the scapula and the axial skeleton.  The [[pelvic girdle]] is, in contrast, firmly fixed to the axial skeleton, which increases stability and load-bearing capabilities.
<ref name="Sellers-1" />

The mobility of the shoulder girdle is supported by a large number of muscles.  The most important of these are muscular sheets rather than fusiform or strap-shaped muscles and they thus never act in isolation but with some fibres acting in coordination with fibres in other muscles.<ref name="Sellers-1" />
; Muscles: of shoulder girdle excluding the glenohumeral joint<ref name="Thieme-Atlas-256" />
:; Migrated from head: [[Trapezius]], [[sternocleidomastoideus]], [[omohyoideus]]
:; Posterior: [[Rhomboideus major]], [[rhomboideus minor]], [[levator scapulae]]
:; Anterior: [[Subclavius]], [[pectoralis minor]], [[serratus anterior]]