has muscle origin has muscle origin lumbrical muscle of manus musculi lumbricales manus The lumbricals are intrinsic muscles of the manus that flex the metacarpophalangeal joints and extend the interphalangeal joints. hand lumbrical muscle EMAPA:36217 Wikipedia:Lumbricals_of_the_hand hand lumbrical lumbrical of hand lumbrical muscle of hand UBERON:0001501 SCTID:181654008 FMA:37385 MA:0002316 flexor digitorum profundus intrinsic muscle of manus