Final answer:
The instrument used to grasp the anterior cervix of the uterus during a total abdominal hysterectomy is the tenaculum forceps.
Step-by-step explanation:
The instrument that would be used to grasp the anterior cervix of the uterus just before dissection from the vaginal vault during a total abdominal hysterectomy is the tenaculum forceps. Tenaculum forceps are used to grasp and manipulate tissues during surgical procedures. They have sharp hooks or points at the end that can securely hold onto the tissue being manipulated.