Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mid-sagittal T2-weighted ss-FSE sections from increasing gestational age (week indicated) showing progressive sulcation and the relationship between cerebral hemispheres and cerebellar vermis through gestation. Note how already at 21-week gestation the vermis completely covers the fourth ventricle (arrow). ss-FSE, single-shot fast spin echo.
