The Question is What is the proper medical term for your thumb?
Answer to this question is Pollex
Options available for this question are:-
Thumb: The short thick finger situated at an angle to the other fingers so it can be opposed to the them. Our thumbs are the things that separate the humans from the monkeys. They are opposable thumnbs. You don’t have opposable Big Toes, nor have they done anything Dorsal: in the same plane as the thumbnail · Volar: in the same plane as the pulp of the thumb · Ulnar: on the side of the thumb toward the hand at a right angle.
What is the proper medical term for your thumb?
The medical for your thumb is the pollex (compared to hallux for your big toe). The thumb is the first, most lateral digit on the radial side of the hand, classified by most anatomists as one of the fingers because its metacarpal bone ossifies in the same manner as those of the phalanges. Other anatomists classify the thumb separately, noting that it has a much different articulation with the metacarpal bone and is composed of one metacarpal bone and only two phalanges.