Aug 12, 2019 · Interactive diagrams show sinus cavity locations and help visualize sinusitis, the most common type of sinus infection. We also go over sinusitis signs and care.

A sinus is a sac or cavity in any organ or tissue, or an abnormal cavity or passage. In common usage, "sinus" usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to it. Most individuals have four paired cavities located in the cranial bone or skull.

1 day ago · These sinuses are divided into three parts: anterior, middle, and posterior, each with distinct drainage pathways into the nasal cavity. This complex structure ensures that air flows freely and mucus drains properly, which is crucial for maintaining ethmoid sinus health.

Near the sinuses, there are several crucial structures: Tear Duct (Nasolacrimal Duct): It drains tears from the inner corner of the eye into the nasal cavity. Eustachian Tube: This tube helps equalize pressure in the ears and opens into the nasopharynx. Adenoids: These are tonsil-like tissues found at the top of the nasopharynx.

Aug 15, 2024 · What are the paranasal sinuses? Your paranasal sinuses are four paired, air-filled spaces (cavities) inside the bones in your face. Most of us know them as just our “sinuses.” Technically speaking, “sinus” is a broad medical term that may refer to different air-filled cavities inside a bone or another type of tissue, like a blood vessel.

Jan 20, 2018 · There are four paired sinuses (named for the skull bones in which they are located) in the human head: Frontal sinuses: The right and left frontal sinuses are located near the center of the...

Jul 24, 2023 · The word “sinus” is most commonly understood to be the paranasal sinuses that are located near the nose and connect to the nasal cavity. There are four paranasal sinuses, each corresponding with the respective bone from which it takes its name: maxillary, ethmoid, sphenoid, and frontal.

All of the sinuses surround important structures including the brain and eye, so sinus problems can affect both. In fact, your nose is connected to most parts of your head and neck anatomy.

The maxillary sinus is supplied by the anterior superior alveolar, middle superior alveolar and posterior superior alveolar branches of the maxillary artery, diverging from the external carotid artery; the posterior lateral nasal artery also contributes to the blood supply of the sinus.

When it comes to our health, sinuses — the air-filled cavities in certain bones of the head and face — are a bit of a mystery. Researchers aren’t sure exactly why we have them. They might be there to keep the head from becoming too heavy, to moisten the air we take in …