sentences:  Cartmill suggests that in small mammals with large eyes and relatively small temporal fossae, where the anterior temporal muscle and the temporalis fascia are pulled to a more lateral position with increasing orbital convergence (front-facing eyes), the tension caused by the contraction of these muscles would distort the orbital margins and disrupt oculomotor precision.Heesy shows that the postorbital bar stiffens the lateral orbit.Without a stiffened lateral orbit, deformation would displace soft tissues, when contraction of the anterior temporalis muscle takes place, thus impeding eye movement.