cerebral commissure
Anatomical term for a bundle of nerve fibers connecting the two cerebral hemispheres; the corpus callosum is the largest example.
The corpus callosum, one of the cerebral commissures, connects the left and right cerebral hemispheres.
脳梁 specifically refers to the corpus callosum, the largest cerebral commissure. 大脳交連 is a broader term encompassing all commissural fiber bundles between the hemispheres.
Compound of 大脳 (cerebrum) + 交連 (commissure, connection). A modern anatomical term.