In physics, a photon is a bundle of electromagnetic energy. It is the basic unit that makes up all light. The photon is sometimes referred to as a quantum of electromagnetic energy. Photons are not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle. Properties of a Photon. Photons have some basic properties that help define what they are and how they behave.
Rad 270 Paranasal Sinuses. The maxillary sinus is aerated at birth. The other sinuses begin to aerate at 6 y/o. Aeration is completed by age 18. Chronic sinusitis T1 weighted normal sinus w&w/o gadolinium Polyps Multidetector CT scans of paranasal sinus in a patient with deviation of nasal septum. Brem M H et al.
The maxillary sinuses are the largest of the paranasal sinuses. These are located within the areas of the upper jaws, below the eye sockets and behind the cheekbone. The drainage of the mucus from the maxillary sinus is through an opening called the ostium. Any obstruction to the mucus flow from the maxillary sinuses may cause a sinus infection. Amongst the other sinuses, maxillary sinus infection is most common.