Uberon definition : A muscle in the forearm and hand that flexes the thumb. It lies in the same plane
as the flexor digitorum profundus.;
Uberon related term : flexor pollicis muscle; flexor pollicis; flexor pollicis longus;
Uberon Taxon note : Modern humans are unique among hominids in having a flexor pollicis longus (FPL) muscle
belly that is separate from that of the flexor digitorum profundus (FDP). While the
FPL is not a separate muscle belly in extant great apes, a distinct tendon from the
FDP belly might be present. In some individuals this tendon tend to act more like
a ligament which restricts extension of the interphalangeal joint of the thumb. In
orangutans there is a tendon similar in insertion and function to the FPL in humans,
but which has an intrinsic origin on the oblique head of the adductor pollicis;