Trochlea of superior oblique

The roll cartilage or the trochlea musculi obliqui superioris ( trochlea, Latin: "Morning Glory ", " pulley " ) is an approximately 3 mm thick cartilage ring on the front inner ( medial ) upper edge of the eye socket (orbit ), by firm connective tissue with the frontal bone is anchored. It has the function to divert the course of the rear upper inclined eye muscle ( abdominal superior) to the outside ( lateral) and to give it to a different direction of pull. Thus, the tendon of the muscle can run smoothly through the annulus, it is lined with a smooth synovial membrane. From the outer edge of the trochlea pulls a tight connective tissue and tendon sheath laterally and connects to the upper retaining strap and the ring band.

Dysfunction

There are two primary disorders of the trochlea known that affect the smooth motion of the tendon through the annulus: the superior oblique click syndrome and superior oblique tendon sheath syndrome ( Brown syndrome ). In both diseases, there is a spindle-shaped thickening of the tendon, which means that they can only be drawn with a very strong effort by the trochlea and has a passive movement restriction of the eye into. In the first case, the resulting disability is intermittent, at the Brown 's syndrome, however, permanently available.