Section through the cerebellum of a 1 year old infant; the cerebellum is the largest section of the hindbrain, located in the lower rear part of the skull. It is essential for muscle tone, balance & sychronization of activity in groups of muscle under voluntary control, converting muscular contractions into smooth, coordinated movements. The cerebellum undergoes rapid development during 1st year of life, allowing the infant to develop coordination which results in the ability to balance, crawl, & finally stand up & walk. Photo from Guigoz film insNaissance du cerveau dix milliards de galaxiesins by C. Edelmann.