Final answer:
Hemiplegia is the paralysis of one limb on one side of the body and one limb on the other side. It can occur as a result of spinal cord injuries, such as a hemisection caused by trauma to the trunk.
Step-by-step explanation:
Hemiplegia is the paralysis of one side of the body, including the upper limb and the lower limb.
In the context of spinal cord injuries, a hemisection, which is a partial damage to the spinal cord, would result in hemiplegia on the side of the trauma, meaning that one leg would be paralyzed.
This condition can occur due to forceful trauma to the trunk, such as in a motorcycle accident, where ribs or vertebrae may fracture and cause damage to the spinal cord.