What is the plural form of “phalanx”?

The plural form of "phalanx" is "phalanges." This term originates from medical terminology, specifically in anatomy where "phalanx" refers to the bones of the fingers and toes. The use of the suffix "ges" to form the plural is characteristic of Greek-derived medical terminology, aligning with the standard pluralization rules for many anatomical terms. Other potential plural forms like "phalanxes," while they may seem plausible in English usage, are less common in medical contexts. Similarly, options like "phalanxen" or "phalanga" do not conform to the accepted linguistic patterns for pluralization in technical language. Therefore, understanding the roots and conventions of anatomical terms clarifies why "phalanges" is the recognized plural form.