The flexor digitorum superficialis is a superficial muscle in the anterior compartment of the forearm. It acts to flex the wrist and, as shown above, to flex the middle and proximal phalanges of digits 2-5.
While your iris is very pretty and comes in all kinds of colors, it has a pretty important job to do! Have you ever looked in a mirror and flicked on a light just to watch your pupil shrink? What you see are the muscles of the iris contracting. The iris adjusts the size of the pupil, regulating the amount of light that enters the eye.
The maxillary and mandibular canines (highlighted in gold) are called the “cornerstone” of the mouth because they are all located three teeth away from the midline, and separate the premolars from the incisors.