Which term describes a small receding chin and lower lip?

Which term describes a small receding chin and lower lip?

• A. Micrognathia
• B. Macrognathia
• C. Retrognathia
• D. Prognathia

Answer: (A)

The main idea here is distinguishing jaw size from jaw position. Micrognathia means the mandible is undersized, which often makes the chin appear recessed and the lower lip sit back because the bone itself is small. Retrognathia, on the other hand, describes a mandible that is positioned farther back than normal, so the chin looks receded even if the jaw size is typical. Macrognathia and prognathia refer to an enlarged jaw and a forward-projecting jaw, respectively. Since the description emphasizes a small chin caused by a small mandible rather than just a backward position, the term that fits best is micrognathia.

The main idea here is distinguishing jaw size from jaw position. Micrognathia means the mandible is undersized, which often makes the chin appear recessed and the lower lip sit back because the bone itself is small. Retrognathia, on the other hand, describes a mandible that is positioned farther back than normal, so the chin looks receded even if the jaw size is typical. Macrognathia and prognathia refer to an enlarged jaw and a forward-projecting jaw, respectively. Since the description emphasizes a small chin caused by a small mandible rather than just a backward position, the term that fits best is micrognathia.