Anterior median line.
Posterior median line.
What’s The Difference: Average, Mean, Median, And ModeAs you probably know the terms average, mean, median, and mode are commonly confused with one another because they all describe ways to talk about sets of numbers.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.