AC: anterior commissure
PC: posterior commissure
The Anterior Commissure (precommissure) is a bundle of white fibers, connecting the two cerebral hemispheres across the middle line, and placed in front of the columns of the fornix. On a sagittal section, it is oval in shape, having a long vertical diameter that measures about 5 mm. (ref: wiki)
The posterior commissure is a rounded band of white fibers crossing the middle line on the dorsal aspect of the upper end of the cerebral aqueduct. (ref: wiki)
Test yourself: Find AC and PC here.
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