An interesting case involving an incompletely developed left manus came to the writer's attention some time ago. The third, fourth, and fifth digits were entirely missing, save for small fleshy outgrowths; the index was about one and a half centimeters long, and obviously contained a bone, while the thumb appeared to be only about a centimeter shorter than the thumb on the subject's other and normal hand. The wrist seemed to possess an unusual degree of flexibility, and the left arm was normal, although of slightly less circumference than the right, the difference being probably due to its less use.
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"A Case Of Congenital Aphalangia In Man,"
Field and Laboratory: Vol. 1
Available at: https://scholar.smu.edu/fieldandlab/vol1/iss2/8