part of sclerite adult head capsule adult tentorium Internal sclerite of the adult head, ventral to the occipital foramen. On each side, it is fused with the head wall for some distance, and then becomes free, extending down to the anterior tentorial pit. It is formed by inward growths of the epidermis. The tentorium provides many of the apodemes for cervical muscles, called tentorial pits. fly_anatomy.ontology FBbt:00004500