Final answer:
Quadriplegia is the term used when paralysis affects all four limbs and the trunk, typically caused by severe spinal cord injuries.
Step-by-step explanation:
When all four limbs are affected by paralysis, it is known as quadriplegia. Quadriplegia can result from spinal cord injuries which may inhibit messages from traveling between the brain and body. Such injuries can stem from various causes, including car crashes, sports injuries, and diving accidents. Quadriplegia affects the arms, hands, trunk, legs, and pelvic organs, resulting in a loss of the ability to move or feel these parts of the body. In contrast, paraplegia affects only the trunk, legs, and pelvic organs, allowing individuals to still use their arms and hands.