Final answer:
Jesus is depicted with an outstretched right hand in a gesture known as the ad locutio, which symbolizes authority and signifies His role as a teacher addressing His disciples.
Step-by-step explanation:
The passage refers to a depiction where Jesus is portrayed as a teacher addressing his disciples using a gesture. This gesture is known as the ad locutio, or the orator's gesture, typically used to signify authority or when making a formal address.
In the imagery, Jesus is shown with an outstretched right hand to emphasize His role as a teacher and authoritative figure. This is highlighted by His classical garb and the scroll He holds in His left hand, further symbolizing knowledge and authority.