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.
The amount of credit hours required for a person to be considered a junior in college depends on the school, but it is typically around 60 credits. Certain schools may require fewer or more credits, such as 56 or 58 credits. Keep Learning.