sellar diaphragm

di·a·phrag·ma sel·'lae

[TA] a fold of dura mater extending transversely across the sella turcica and roofing over the hypophyseal fossa; it is perforated in its center for the passage of the infundibulum. Synonym(s): sellar diaphragm ☆ , diaphragm of sella turcica, diaphragm sellae, tentorium of hypophysis