a shallow depression in the posterior dorsal midline of the tongue that is the remnant of the more cranial part of the embryonic duct from which the thyroid gland developed.
The shallow depression in the posterior dorsal midline of the tongue that we are referring to is known as the foramen cecum
The shallow depression in the posterior dorsal midline of the tongue that we are referring to is known as the foramen cecum. Embryologically, this structure is significant as it represents the remnant of the thyroglossal duct, also called the thyroglossal tract.
During early development, the thyroid gland begins to form at the base of the tongue and then migrates downward towards its final position in the neck. The thyroglossal duct forms as a connection between the developing thyroid gland and the tongue.
As the thyroid gland descends, the thyroglossal duct normally starts to disappear, leaving behind small remnants. The most prominent remnant is the foramen cecum, which is often visible in the posterior midline of the tongue. In some cases, the thyroglossal duct may not completely disappear, which can lead to the formation of a thyroglossal duct cyst or sinus along the path of the duct.
In summary, the foramen cecum is a shallow depression found on the posterior dorsal midline of the tongue. It is the remnant of the thyroglossal duct, which is an embryonic structure from which the thyroid gland develops.
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