Aplasia of the superior oblique tendon

Abstract

The authors describe two cases with unilateral aplasia of the superior oblique tendon. The incomitance pattern could not be explained solely by the lacking torque of the superior oblique muscle. Rather, a considerable adaptation of the central nervous system had to be invoked resulting in compensatory innervation of the remaining seven vertical muscles of both eyes.

Key Words:

• Superior oblique muscle
• aplasia
• adaptation