WEBVTT 00:12.100 --> 00:15.200 By 6 weeks the cerebral hemispheres are growing 00:15.233 --> 00:22.967 disproportionately faster than other sections of the brain. 00:22.1000 --> 00:25.767 The embryo begins to make spontaneous 00:25.800 --> 00:29.800 and reflexive movements. 00:29.833 --> 00:31.400 Such movement is necessary 00:31.433 --> 00:34.900 to promote normal neuromuscular development.