The ligament allows for a change of the functional origin of the levator palpebrae superioris muscle, enabling the superior tarsus ( eyelid ) to be elevated superiorly rather than directly toward the muscle's origin on the sphenoid bone . attaches medially to the pulley of superior oblique muscle Trochlea of superior oblique and laterally to the lacrimal gland 10mm above Whitnall tubercle.
42.
Jenkins e . a . claimed that the unique articulation in " Arcticodactylus " between the main wing metacarpal and the wing finger, with two rounded condyles, was a transitional shape between the ancestral form that featured a single rounded articulation surface on the metacarpal allowing a considerable amount of lateral movement, and the condition in later pterosaurs that showed a gentle depression or trochlea.
