Final answer:
The neck is the last part of the body to be immobilized during the immobilization of a spinal trauma patient.
Step-by-step explanation:
The last part of the body to be immobilized during the immobilization of a spinal trauma patient is the neck. The neck is immobilized last because it is important to support the head and prevent further damage to the spinal cord. Immobilizing the neck involves the use of a cervical collar or other devices that restrict movement.