Trochlea

[trokf -le-ah) [rpox^ua, pulley]. A part having the nature of a pulley. T. of the Humerus, a surface acting as a pulley at the lower extremity of the humerus. T. of the Superior Oblique, T. of the Orbit, the ligamentous ring or pulley, attached to the upper margin of the orbit, which transmits the tendon of the superior oblique muscle of the eye. 637