At the apex of the sulcus terminalis, a small pit called the _________. It is the remnant of the upper part of the ____________. Fill in the blanks by selecting the correct option.
Lingual frenulum and foramen caecum respectively
Filiform papillae and lingual tonsils respectively
Circumvallate papillae and thyroglossal duct respectively
Foramen caecum and thyroglossal duct respectively
At the apex of the sulcus terminalis, a small pit is seen. It is called the foramen caecum. It is the remnant of the upper part of the thyroglossal duct (site of thyroid gland origin). Hence, the correct answer is option d.