The sinuses are multiple air-containing bony cavities around the nasal cavity. The sinuses are paired left and right, and there are four pairs in total, including the frontal sinuses, maxillary sinuses, pterygoid sinuses and sieve sinuses.
1. Frontal sinus: located near the maxillary part of the bilateral eyebrow arch between the two sides of the frontal sinus is very different, and the size of the irregular, opening in the middle of the nasal passages at the sieve funnel.
2. Maxillary sinus: the maxillary sinus is the largest sinus cavity in the 4 groups of sinuses, located in a bilateral cheek, opening in the middle nasal passage at the semilunar fissure.
3. Pterygoid sinus: It is located in the pterygoid bone, near the back of the turbinate, mostly asymmetric in size and shape, and opens into the pterygoid sieve fossa.
4. Sieve sinuses: located in the bilateral medial canthus, divided into anterior and posterior groups of sieve sinuses, the former group of sieve sinuses opening in the middle nasal tract, the latter group of sieve sinuses opening in the upper nasal tract.
The sinuses are located in different positions within the skull, secondary infection may cause sinusitis, should develop a good lifestyle, appropriate physical exercise, improve their resistance, if any discomfort in a timely manner to seek medical attention.