Winter and spring are the times when many dangerous infectious diseases occur, because the weather changes to be humid and wet, and at the same time, it is the season of many festivals, creating favorable conditions for bacteria and viruses to develop, causing diseases in humans and outbreaks into epidemics.

Blondeau X-ray helps to clearly reveal the structures of the skull base, the occipital bone is shown below, the facial sinuses (frontal, parietal, maxillary) and the orbits are clearly seen on the upper part of the film. In addition, Blondeau's position shows the zygomatic arch and the mandible.

The function of the sense of smell helps us to identify the presence of volatile substances in the air by forming specific senses. Humans are capable of identifying quite a few odors. This article will provide more information about the function of the olfactory nerve.