IL - Interclavicular ligament
SCJ - anterior view of SC joint and the SC ligament
CLAVICULAR ELEVATION AND DEPRESSION OCCUR AROUND THE JOINTS A-P AXIS
The joint's AP axis is a line that connects two points (indicated on the figure by filled circles):
CLAVICULAR PROTRACTION AND RETRACTION OCCUR AROUND THE JOINT'S VERTICAL AXIS.
Anterior movement of the clavicle's distal end is termed "protraction," while posterior movement of the distal end is termed "retraction."
BACKWARD AND FORWARD ROTATION OF CLAVICLE OCCUR AROUND THE CLAVICLE'S "LONG" OR LONGITUDINAL AXIS.
Backward rotation is defined as a backward (posterior) movement of the clavicle's superior surface.