<prompt> Power grip of hand is a function ofLong flexorsSho flexorsPalmaris brevisLumbricals  <response>: Power grip is by extrinsic muscles of hand which originate in the forearm and inse in the hand - Long flexors Precision grip is a function of the intrinsic muscles of hand which originate and inse in the hand. Ref: Grays Anatomy The Anatomical Basics of Clinical Practice 41 e pg 860. 