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Reference.org
Medullary pyramids (brainstem)
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<p>In <a href="/facts/Neuroanatomy/VJxVXoWm">neuroanatomy</a>, the medullary pyramids are paired <a href="/facts/White_matter/mvHqXJYk">white matter</a> structures of the <a href="/facts/Brainstem/lD3WQbXM">brainstem</a>'s <a href="/facts/Medulla_oblongata/KdSbCCkB">medulla oblongata</a> that contain motor fibers of the <a href="/facts/Corticospinal_tract/txupaYD6">corticospinal</a> and <a href="/facts/Corticobulbar_tract/4oFMX0o6">corticobulbar</a> tracts – known together as the <a href="/facts/Pyramidal_tracts/GKaxN5JL">pyramidal tracts</a>. The lower limit of the pyramids is marked when the fibers cross (<a href="/facts/Decussation/THJI9Mht">decussate</a>). </p>