Final answer:
When prone during a CT colonography, air travels anteriorly, towards the front of the body. The inhaled air passes through the pharynx, larynx, trachea, bronchi, and finally the bronchioles.
Step-by-step explanation:
When a patient lies prone for a CT colonography, the air used to inflate the colon tends to travel anteriorly, or towards the front of the body, because in this position the anterior part of the abdomen is facing upwards. This air distribution helps to provide a clear image of the colon for the CT scan. Note that the question seems to mix different anatomical contexts, but focusing on the position of a patient in a CT colonography, the air goes towards the front of the abdomen (anterior).
To clarify the order in which inhaled air travels once it enters the body, the correct path is: the air first goes into the pharynx, then passes through the larynx, then to the trachea, from there it enters the bronchi and finally reaches the bronchioles.