Käsivarsiin

Käsivarsiin is a Finnish grammatical form meaning “to the forearms.” It is the illative plural form of the noun käsivarsi, which refers to the forearm—the part of the arm between the elbow and the wrist. The standard plural nominative is käsivarret, and the illative plural suffix -iin is attached to that stem to yield käsivarsiin.

In Finnish, the illative case expresses direction toward or into a destination or area. Therefore käsivarsiin is used when describing movement toward the forearms, the location reached by an action, or a change that involves the forearms as a target area. The form appears primarily in contexts such as anatomy, medicine, sports, or descriptive prose where precise direction to a body part is important.

Examples of usage are typically in sentences describing movement or placement involving the forearms. For instance, a sentence might indicate that something was applied to the forearms or that sensation or influence spread toward the forearms. Because the illative plural conveys a sense of destination, käsivarsiin is most natural in statements about reaching, entering, or affecting the forearms rather than simply being on or near them.

Notes on usage: while käsivarret is the common everyday plural for forearms, käsivarsiin is the specialized illative form used when the sentence requires a directional or destination nuance. The term is primarily encountered in formal, medical, or anatomical writing and more descriptive prose.

See also: käsivarsi, käsivarret, illatiivin essive forms in Finnish grammar, Finnish anatomy terminology.