sinus etymology

Etymology:

The word "sinus" derives from the Latin term "sinus," which means "curve" or "bend."

Meaning:

In anatomy, a sinus refers to a cavity or air-filled space within a bone, particularly in the skull. Specifically, it refers to the following:

• Paranasal sinuses: Air-filled cavities located in the skull around the nose. They include the maxillary, frontal, sphenoid, and ethmoid sinuses.
• Venous sinuses: Channels within the skull that drain blood from the brain. They include the superior sagittal sinus, transverse sinuses, and cavernous sinus.

Origin:

The term "sinus" was first used in anatomy around the 16th century. It was derived from the Latin word "sinus," which originally referred to a fold or curve. Anatomists adopted the term to describe the curved cavities and channels found within the skull.

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