1) Brain 2) Enclosed within the skull 3) Neural structure 4) The brain 1) Brain 
• (n.) The contents of the cranium; the brain.
(en-sef´ә-lon) brain.
En·ceph'a·lon noun [ New Latin See Encephalos .] (Anat.) The contents of the cranium; the brain. 
Type: Term Pronunciation: en-sef′ă-lon, lă Definitions: 1. That portion of the cerebrospinal axis contained within the cranium, composed of the prosencephalon, mesencephalon, and rhombencephalon.
encephalon 1. The brain of a vertebrate. 2. That part of the central nervous system which includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord.
Greek en = within, and kephalos = head, hence, the brain.
the brain.