Intima (Tunica intima)

Innermost layer of the vessel wall of arteryn, veinn or larger lymphatic vessels. It consists of an internal epitheliumcell layer, which has a connective tissue layer. Depending on the vessel type, layers of muscular or elastic fibres follow it outwards.

https://de.wikipedia.org/wiki/Tunica_intima _{(Wikipedia CC-by-sa-3.0)}