In the front, superior surface of the thalamus but separate from the inner, medial surface by a salient margin is the taenia thalami (Latin for "flat band" of the thalamus). The bottom epithelial lining of the third ventricle is in between the tela choroidea and the taenia thalami.
References
This article incorporates text in the public domain from page 809 of the 20th edition of Gray's Anatomy (1918)
