it is the ladmark used in giving deltoid injections.
The acromion process is on the scapula.
acromion process
Clavicle
The acromion process
Several muscles that serve the shoulder, arm and chest attach to the acromion.
What people call the tip of the shoulder is the boney prominence that forms the upper part of the shoulder joint. This is a piece of bone that is part of the shoulder blade and called the acromion.
The acromion process
The acromion is the part of the scapula or shoulder blade that forms the tip of the shoulder. The acromion is an anatomical feature on the shoulder blade (scapula), together with the coracoid process extending laterally over the shoulder joint.
The joint between the lateral end of the clavicle and the acromion process of the scapula is the acromioclavicular joint. This joint is sometimes abbreviated "AC joint."
Together with the acromion, the coracoid process serves to stabilize the glenohumeral (shoulder) joint .
Acromion process and sternum
It is from the acromion to the corocoid process. Both features of the scapula bone.