Heterotopia are nodules or clumps of misplaced neurons that did not move to the correct location in the brain during earlydevelopment. Heterotopia are common malformations of cortical development.
Other definitions: 1  Freshman: a student who has completed fewer than 30 credit hours. 2  Sophomore: a student who has completed 30 or more credit hours. 3  Part time: a student carrying fewer than 12 credit hours in a fall or spring semester.
Fifteen or 16 hours per semester is an average full time load. By that measure, you would need *at least* 24-32 credit hours to escape freshman status and be called a sophomore. This figure will vary by institution - check at the college of your choice. Many, if not most, colleges have a copy of the student handbook available online.