What is the term for the upper arm?

The term for the upper arm is "brachial." This terminology is derived from the word "brachium," which refers specifically to the region between the shoulder and the elbow. In anatomical contexts, the brachial region is significant for understanding muscle groups, blood vessels, and nerves that are associated with arm movement and function.

Cervical refers to the neck region, specifically involving the vertebrae and structures within the neck. Acromial pertains to the shoulder area, particularly the acromion process of the scapula, which is not directly related to the upper arm itself. Sacral refers to the sacrum, a triangular bone at the base of the spine, and does not relate to the arm. These distinctions highlight why the term "brachial" is specifically used to describe the upper arm.