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Overview of the general organization of the thenar musculature in (a) macaques and (b) gibbons. In gibbons, there is a clear distinction between the superficial and deep head of the FPB. APB (m. abductor pollicis brevis), FPB (m. flexor pollicis brevis), FPBs (m. flexor pollicis brevis, superficial head), FBPd (m. flexor pollicis brevis, deep head), OPP (m. opponens pollicis), ADPo (m. adductor pollicis, oblique head), ADPt (m. adductor pollicis, transverse head)
