Levels of organisation of the human body 1. cells: 2. tissues: 3. organs: 4. systems: 5. organism The cell performs all of the life functions: + Planes of the body and directional terms + oblique The directional terms are used to localise parts of the body. ‘The hand is distal to the forearm.’ Anatomical position – standing erect, facing the observer, arms are at the sides with palms facing forwards. Superior (cranial) – Inferior (caudal) – Anterior (ventral) – Posterior (dorsal) – Medial – Lateral – ipsilateral contralateral bilateral Proximal – Distal – Superficial – Internal (deep) – Prone – Supine –