endocranial

noun, plural en·do·cra·ni·a [en-doh-krey-nee-uh] /ˌɛn doʊˈkreɪ ni ə/. Anatomy.

1. the inner lining membrane of the skull; the dura mater.
2. the inside surface of the skull.

noun plural -nia (-nɪə)

1. anatomy the thick fibrous membrane that lines the cranial cavity and forms the outermost layer of the dura mater

adj.

1. Within the cranium.
2. Of or relating to the endocranium.

n. pl. en•do•cra•ni•a (-nē-ə)

1. The outermost layer of the dura mater.
2. The inner surface of the skull.