Which measurement increases with gestational age and is used to monitor cerebellar development in the fetus?

• A. Abdominal circumference increases with gestational age.
• B. Cerebellar diameter increases with gestational age.
• C. Fetal heart rate increases with gestational age.
• D. Head circumference increases with gestational age.

Answer: (B)

The key idea is that the cerebellum’s growth is tracked directly to assess neurodevelopment as pregnancy progresses. Measuring the cerebellar diameter, typically the transcerebellar diameter in an axial view, increases as gestational age advances and provides a direct gauge of cerebellar size and maturation. This measurement grows in a predictable way with advancing pregnancy, making it useful to monitor cerebellar development and help estimate gestational age in the later second to third trimester. Other measurements like abdominal circumference or head circumference reflect overall fetal size rather than specific cerebellar growth, and fetal heart rate isn’t tied to cerebellar development. So, cerebellar diameter is the measurement that grows with gestational age and is used to monitor cerebellar development.