Main image shows how, when properly positioned, the cuff of the endotracheal tube should be just below the vocal cords. Insert shows how the distal tip of the tube should be above the carina.

MacIntosh laryngoscope blade used for inserting tracheal and breathing tubes.

(Step 1) Hold airway open so that its curvature follows that of the floor of the nose.

Insert shows how the distal tip of the tube should be above the carina.

(Step 2) Slide the airway into the nostril until its flange is flush against the opening of the nostril; at that point distal end will be in the oropharynx.

Larynx and trachea, feline