Final answer:
Magill forceps are used to grasp the endotracheal tube during nasal intubation to assist with correct placement into the trachea for artificial ventilation.
Step-by-step explanation:
The proper function of Magill forceps when aiding in nasal intubation is to grasp the endotracheal tube (ETT). The forceps are designed for use during intubation procedures to manipulate the position of the ETT as it is guided through the oropharynx and into the trachea. They help in aligning the tube with the glottic opening for proper placement into the trachea, ensuring the patient is able to receive artificial ventilation. Magill forceps are not used to retract the uvula, stabilize the tongue, or open the nasal cavity during the nasal intubation process.