Abstract: An alignment mark is adapted to be positioned relative to a head of a patient, and includes an alignment unit and a marking unit. The alignment unit includes a pad member and an alignment member. The pad member is adapted to adhere to a scalp of the patient. The alignment member has a threaded section that extends through the pad member and that is adapted to be threadedly locked into a cranium of the patient, and a head section that is opposite to the threaded section and that abuts against the pad member. The marking unit is removably disposed on the alignment unit, and includes a marking member.

Abstract: A stereotactic stabilizer is adapted to be mounted to a fixing device and to be mounted with a stereotactic surgical instrument. The stereotactic stabilizer includes base seat and a rod member. The base seat has a main portion and an instrument connecting portion that is provided on the main portion and that is adapted to be mounted with the stereotactic surgical instrument. The rod member extends from the base seat and is adapted to be mounted to the fixing device so as to be positioned relative to a head of a patient.