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.
Human sinuses are broken into four groups known collectively as the paranasal sinuses. These four groups are: maxillary, frontal, sphenoid and ethmoids. All four are located in the bones of our skulls, but they are also attached to the nose. When one of them becomes infected it can affect more than just the nasal passages. It can cause pain and swelling in the eyes, face, or jaw. For example, the maxillary sinuses; which are located beneath the eyes and also in the facial cheekbones on the side of the nose, can cause jaw pain when they become infected.