In Armadillos, Sloths, and Megatheriidae, the acromion is very long and the clavicle is well developed.
In the scapula the acromion joins the coracoid as in Bradypus; the clavicle is large.
Fractures of the scapula may implicate the body, the surgical neck, the acromion, or the coracoid process.
An ally of the present animal, for instance, the Hippopotamus, has the acromion developed.
The acromion and coracoid processes of the scapula are rudimentary.
It is a remarkable fact that the acromion is joined to the rest of the spine of the scapula by a joint.
As in other American Edentates, the acromion joins the coracoid.
It has no acromion, which is usually though not always absent in Ungulates.
The tip of the acromion is usually employed as a fixed point in measuring the length of the upper arm.
I saw grooving of the crest of the spine, but never happened to meet with a fracture of the acromion process.
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.