Line A on this image is pointing to the: 
Definitions:
Prefrontal Cortex
The part of the brain located at the front of the frontal lobe, involved in complex behaviors including decision making and moderating social behavior.
Wild Guesses
Estimations or predictions made with little to no evidence or rationale, often relying solely on intuition.
Alzheimer's Disease
A progressive neurodegenerative disorder characterized by cognitive decline, memory loss, and changes in behavior.
Brain Cells
Cells located in the brain, including neurons and glial cells, responsible for processing and transmitting information.
Q21: How is the central ray positioned to
Q23: In what year was the first human
Q29: What is the central-ray angulation for the
Q50: The muscle controlling the opening between the
Q50: Which plane specifically divides the body into
Q76: Which projection of the colon best demonstrates
Q85: The anatomy labeled with the arrow in
Q96: Food and fluid should be withheld for
Q103: How is the upper extremity positioned for
Q111: The plane that divides the body into