![]() ![]() ![]() The primary ossification center appears near the glenoid cavity during the 8th week of fetal development. The scapula develops in the embryonic stage and ossifies from one primary and seven secondary centers. It stabilizes the shoulder capsule during excessive arm motion by rotating upwards and downwards.During some motions, like shrugging the shoulders, the entire shoulder capsule moves up and down due to elevation and depression of this bone.It assists in both forward and backward movement of the pectoral girdle and chest muscles by moving closer and away from the vertebral column.The scapula helps in several daily movements and smooth motion of the upper arm, based on the movements mentioned above. There are 17 muscles attached to it that help to produce these movements. It can move in six different ways, towards (retract) and away (protract) from the vertebral column, up and down (elevate and depress), and also rotate upwards and downwards. The movement of this bone is coupled with the humerus, meaning whenever you move your arm, your scapula also moves.
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