Final answer:
The missing term is Straight sinus. The superior sagittal sinus drains into the confluence of sinuses, which includes the occipital sinus and straight sinus. The transverse sinuses connect to the sigmoid sinuses, which then connect to the jugular veins.
Step-by-step explanation:
The missing term is 4) Straight sinus. The superior sagittal sinus drains into the confluence of sinuses, which includes the occipital sinus and straight sinus. The transverse sinuses connect to the sigmoid sinuses, which then connect to the jugular veins.