Final answer:
True, the thumb does not have a middle phalanx; it only has a proximal and a distal phalanx.
Step-by-step explanation:
The statement that a middle phalanx is not present in the thumb is True. Each thumb has only two phalanges; they are the proximal and distal phalanx bones. In contrast, the other fingers—digits 2 through 5—on the hand have three phalanges each: the proximal, middle, and distal phalanges. Therefore, it is accurate to say that there is no middle phalanx bone in the thumb.