n. 脑, 脑髓

[医] 脑

[ noun ]
that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord
<noun.body>

encephalon \en*ceph"a*lon\, n.; pl. {encephala}. [NL. See
{Encephalos}.] (Anat.)
The contents of the cranium; the brain.