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Trochlea, trok′lē-a, n. a pulley-like cartilage through which the superior oblique muscle of the eye-ball passes: in the elbow-joint, the articular surface of the lower extremity of the humerus, grasped by the greater sigmoid cavity of the ulna.—adjs.

Troch′lēar, shaped like a pulley; Troch′lēary, relating to the trochlea.

That which represents the tendinous part, which is also fleshy, as we have just pointed out, arises above with the common extensor of the toes, from the femur, in the fossa situated between the trochlea and the external condyle; whilst below, after having given passage to the tendon of the preceding portion, as in the horse, it is inserted into the metatarsus and the cuneiform bones.

The inferior extremity, transversely enlarged, presents an undulating articular surface, which reminds us of the trochlea and the condyle of the human humerus; on which, however, the condyle is more sharply defined from the trochlea.

In contrast to the condition found in man, the condyle descends to a level a little below that of the internal lip of the trochlea.