What is sulcus terminalis?

The sulcus terminalis is a shallow groove that separates the posterior part of the tongue, known as the body of the tongue, from the base of the tongue. It is a natural furrow that runs horizontally across the surface of the tongue and is often slightly V-shaped or U-shaped in appearance.

The sulcus terminalis is important in distinguishing between the body of the tongue, which contains the majority of the taste buds, and the base of the tongue, which houses the lingual tonsils and is involved in the swallowing process.

The sulcus terminalis is also significant in clinical applications as the site where the foramen cecum, a blind pit that represents the remnants of the thyroglossal duct, is located. This pit can sometimes become inflamed or infected, resulting in a condition known as a thyroglossal duct cyst.

Overall, the sulcus terminalis plays a key role in the anatomy and function of the tongue, helping to delineate different regions of the tongue and serving as a landmark for various structures and conditions.