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.
To be considered a Freshman, you need 0-29 credit hours. To be considered a Sophomore, you need 30-59 credit hours. To be considered a Junior, you need 60-89 credit hours.