Fig. 31. Length-tension curves in a human lateral rectus muscle that was detached from the globe. The innervation is determined by the fixation effort of the opposite eye. At each innervation level, the tension required to stretch the muscle to various lengths is plotted. The dotted lines represent developed tension (i.e.,, total tension minus curve PM, the passive muscle tension). N, nasal; I, temporal. (Robinson DA, O'Meara DM, Scott AB et al: Mechanical components of human eye movements. J Appl Physiol 26:548, 1969.)