BRACHIUM By N., Pam M.S. - April 7, 2013 n. in human anatomy, refers to the part of the upper arm, from one's shoulder to the elbow. Also refers to any structure or process which relates to the arm. - pl. brachia, adj. brachial. BRACHIUM: "In evolution, the brachium or arm of a human is homologous to a wing or flipper." Related Psychology Terms BRACHIUM BRACHIAL PLEXUS ATRIUM LONGITUDINAL AVIATION PSYCHOLOGY BELL-MAGENDIE LAW ANIMAL-HUMAN COMPARISON PSYCHOLOGICAL KINESIOLOGY EDUCATIONAL SPORT PSYCHOLOGIST SEXOLOGY Cite this page: N., Pam M.S., "BRACHIUM," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/brachium/ (accessed May 31, 2020).