Isandiso se-triceps umsebenzi wokuzihlukanisa osebenza umsipha ongemuva kwengalo engenhla. Lo msipha, obizwa ngokuthi i-triceps, unamakhanda amathathu: ikhanda elide, ikhanda elingemuva, nekhanda eliphakathi. Amakhanda amathathu asebenza ndawonye ukuze anwebe ingalo engxenyeni yendololwane. Ukuzivocavoca kwe-triceps kuwumsebenzi wokuzihlukanisa ngoba kuhilela ukunyakaza endaweni eyodwa kuphela, i-elbow joint.