part of pupal head pupal tentorium TGMA:0000959 TGMA:0000959 The pair of endoskeletal struts of the cranium formed chiefly of the fused anterior and posterior tentorial arms. In mosquito pupae, the right and left halves of the tentorium are not connected, each extends through the head from the anterior tentorial pit to the soft membrane forming the back of the head. bone-like tapering rod default_namespace internal rod sclerotized rod tentorial rod