The updating of anatomical terms is essential to facilitate teaching and learning as well as international communication through publications and presentations at scientific events. In the posterior wall of the axilla, the teres major, teres minor and triceps brachii muscles form three spaces through which neurovascular structures of clinical significance run. The current study seeks to define and propose terms for these spaces which have been omitted by Terminologia Anatomica. The definition of the Latin term 'Spatium' was investigated using A Latin Dicionary, while the term 'Espacio' was analyzed using Diccionario panhispánico de términos médicos (Real Academia Nacional de Medicina de España, 2023), as well as the lexemes of the words 'scapula' and 'humerus', for which the Diccionario Médico-