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Answer for the clue "Brain matter ", 4 letters:
obex

Word definitions for obex in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context anatomy English) The point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord.

Wikipedia Word definitions in Wikipedia
The obex (from the Latin for barrier ) is the point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord . The obex occurs in the caudal medulla . The decussation of sensory fibers happens at this point.

Usage examples of obex.

One of the first to have a look at a Qella recovered on Maltha Obex some years earlier, she was currently a member of the xenobiology team tasked with compiling a profile on the Yuuzhan Vong.