trochlea

(trok'le-ah) [L. pulley.] i structure serving as a pulley. 2. sniooth articular surface of bone upon which another glides. 3. [BNA] A fibrous loop in the orbit, near the internal angular proce of the frontal bone, through which pa es the tendon of the superior oblique muscle of the eye. t. fem'or is, the smooth anterior depre ion between the condyles of the femur; facies patellar is [BNA]. t. hu'meri [BNA], trochlea or pulley of the humerus, the grooved surface at the lower end of the humerus articulating with the great sigmoid cavity of the ulna. t. labyrin'thi, cochlea, t. phalan'gis [BNA], pulley of the phalanx, the rotuided articular or condyloid surface at the distal end of the first and second phalanx of each finger and toe. t. tali [BNA], pulley of the ankle-bone, the saddle-shaped articular surface of the ankle-bone articulating with the under surface of the tibia.