In the Theromorpha it has an acromial process with which the precoracoid articulates, and it is very large in Dinosauria.
A small tubercle (deltoid tubercle) which frequently exists near the acromial end is liable to suggest the presence of a fracture.
acromion a·cro·mi·on (ə-krō'mē-ŏn', -ən)
The outer end of the scapula, extending over the shoulder joint and forming the highest point of the shoulder, to which the collarbone is attached. Also called acromial process.