Antegrade amnesia: Amnesia in which the loss of memory relates to events that occur after a traumatic event. There is inability to recall new information. Old information can be recalled. Antegrade amnesia may follow brain trauma. Also called antegrade amnesia. This type of amnesia is in contrast to retrograde amnesia in which the lack of memory relates to events that occurred before a traumatic event.
- Antenatal surgery
Antenatal surgery: The surgical treatment of the fetus before birth. Also called prenatal surgery or, most often, fetal surgery. Fetal surgery is done when the fetus is not expected to live long enough to make it through to delivery or to live long after birth unless fetal surgery is performed. For instance, if a fetus […]
Anterior: The front, as opposed to the posterior. The anterior surface of the heart is toward the breast bone (the sternum). For a more complete listing of terms used in medicine for spatial orientation, please see the entry to “Anatomic Orientation Terms”.
- Anterior chamber
Anterior chamber: The space in the eye that is behind the cornea and in front of the iris. The cornea is the outer, transparent, dome-like structure that covers the iris, pupil, and the anterior chamber. The iris is the colored ring of tissue suspended behind the cornea and immediately in front of the lens; it […]
- Anterior cruciate injury
Anterior cruciate injury: A knee injury involving the anterior cruciate ligament (ACL). The ACL runs diagonally deep inside the knee from the center of rotation of the end of the femur (the thigh bone) to the top of the tibia (the larger bone in the lower leg). Females are seven times more likely to suffer […]
- Anterior cruciate ligament
Anterior cruciate ligament: A ligament in the knee that crosses from the underside of the femur (the thigh bone) to the top of the tibia (the bigger bone in the lower leg). Abbreviated ACL. Injuries to the ACL can occur in a number of situations, including sports, and can be quite serious, requiring surgery. The […]