This document is designed to summarise all the information you need on muscle movment. The colours and design help in making studying more fun while also implementing memorisation with the layout.
A saddle-type joint
The sternoclavicular joint has a large degree of
mobility.
There are several movements that require this
joint’s involvement:
- Elevation of the shoulders – shrugging the
shoulders or abducting the arm over 90º
- Depression of the shoulders – drooping
The acromioclavicular joint is a saddle-type joint shoulders or extending the arm at the
that allows movement of the clavicle, shoulder behind the body
predominantly in anteroposterior and vertical - Protraction of the shoulders – moving the
planes. Some rotation also occurs. The ability to shoulder girdle anteriorly
thrust the arm and shoulder forward requires - Retraction of the shoulders – moving the
sound function of this joint. shoulder girdle posteriorly
- Rotation – when the arm is raised over the
head by flexion, the clavicle rotates passively
as the scapula rotates. This is transmitted to
the clavicle by the coracoclavicular ligament
Saddle joint; biaxial joint i.e., it allows
movements in two planes- in which articular
surfaces have both convex and concave regions.
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