1) Membrane 2) The dura mater 3) Tissue layer 
The endocranium in comparative anatomy is a part of the skull base in vertebrates and represent the basal, inner part of the cranium. The term is also applied to the outer layer of the dura mater in human anatomy. ==Structure== Structurally, the endocranium consists of a boxlike shape, open at the top. The posterior margin exhibit the foramen magn...
The lining membrane of the cranium, or dura mater of the brain. ... Synonym: entocranium. ... (05 Mar 2000) ... 
(en″do-kra´ne-әm) the endosteal layer of the dura mater of the brain.
Type: Term Pronunciation: en′dō-krā′nē-ŭm Definitions: 1. The lining membrane of the cranium, or dura mater of the brain. Synonyms: entocranium
[n] - membrane lining the inside of the skull
noun membrane lining the inside of the skull
Greek endo = within, and kranion = skull, hence, the outer endostial layer of the dura mater.
the inner lining membrane of the skull; the dura mater. · the inside surface of the skull.