In the fourth week a swelling appears from the second pharyngeal arch, in the midline, called the foramen caecum, which is the point where the embryological thyroid begins to descend.
2.
Typically, the cyst will move upwards on protrusion of the tongue, given its attachment to the embryonic duct, as well as on swallowing, due to attachment of the tract to the foramen caecum.
मोबाइल