Noun
propatagium (plural propatagia)
The portion of patagium stretching from the neck to the first digit
The first, called the propatagium ("first membrane"), was the forward-most part of the wing and attached between the wrist and shoulder, creating the "leading edge" during flight. Source: Internet
Wing anatomy A bone unique to pterosaurs, known as the pteroid, connected to the wrist and helped to support a forward membrane (the propatagium) between the wrist and shoulder. Source: Internet