Which part of the scapula is the highest portion?

The acromion process is the highest portion of the scapula and serves as a key anatomical landmark. It is an extension of the spine of the scapula and forms the highest point of the shoulder. Its position allows the acromion to articulate with the clavicle, contributing to the stability and movement of the shoulder joint.

In contrast, the coracoid process, while also a prominent feature of the scapula, is positioned more anteriorly and inferiorly, making it lower than the acromion. The glenoid cavity is a shallow socket that receives the head of the humerus, which is situated laterally on the scapula and does not reach the same height as the acromion. Lastly, the spine of the scapula, although it contributes to the overall structure of the scapula, does not reach as high as the acromion itself, as the spine transitions into the acromion at its highest point.

Therefore, the acromion process is correctly identified as the highest part of the scapula.