The following questions refer to the figure below of a midsagittal, T1-weighted MRI of the brainstem. 
-Which line points to the splenium of corpus callosum?
Definitions:
Mamm/o
A prefix related to the breast or mammary glands.
Men/o
A prefix relating to the menstrual cycle or menstruation.
Retro-
A prefix meaning backward or behind, often used in medical and scientific contexts to indicate reversal or a backward position.
Post-
A prefix meaning after in time or sequence, following, or subsequent to.
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