Ma'anar ƙamus na jumlar "ɓangarorin jiki" wani tsari ne na jiki ko sashin jiki wanda ya ƙunshi sassa masu alaƙa da yawa kuma yana yin ayyuka masu rikitarwa. Misalan sassan jiki masu rikitarwa sun haɗa da kwakwalwa, zuciya, huhu, hanta, koda, da gabobin haihuwa. Waɗannan gabobin sun ƙunshi nau'ikan kyallen takarda da nau'ikan tantanin halitta waɗanda ke aiki tare don aiwatar da ayyuka na musamman masu mahimmanci ga lafiyar jiki gaba ɗaya da walwala. Rukunin sassan jiki suna buƙatar daidaitaccen daidaitawa da ƙa'idodi don yin aiki yadda ya kamata, kuma duk wani rushewa ko lalacewar sashe na iya haifar da sakamako mai mahimmanci ga gaba ɗaya gabobin jiki ko tsarin.