eversión

Eversión is a Spanish noun that designates the act or process of turning outward or away from the midline. In anatomy and medicine, it is used to describe movements or positions in which a structure is oriented toward the exterior; the opposite term is inversión (inversion). The word derives from Latin eversionem, eversionis, from ex- “out” and vertere “to turn.”

In human anatomy, eversion commonly refers to the lateral tilt of the sole of the foot away from the midline; this movement contrasts with inversion and plays a role in balance and gait at the ankle joint. In ophthalmology, eyelid eversion describes turning the eyelid outward to expose its inner surface for examination or treatment. In botany, eversion can describe parts of a plant, such as leaves or petals, that turn outward from the stem or axis, often as a response to growth or environmental conditions. In surgical contexts, eversión denotes the deliberate turning of tissue outward to access a surface or to expose lesions.

Eversión is used across disciplines to convey outward orientation, with context usually clarifying the specific structure involved. Related terms include inversión (inversion), supinación y pronación (in relation to limb movements), and other orientation terms in anatomy.