Interestingly, although no left-eye adduction could be elicited on lateral gaze or convergence, we observed adductive movements during sucking. Missing innervation of the medial rectus by oculomotor nerve fibers was replaced by fibers, most likely originating from a motor branch of the trigeminal nerve. Thus, the lack of innervation of the lateral rectus (Figure 2A) appears to have triggered a sequence of aberrant nerve sprouting, resulting, initially, in a shift of fibers originally meant for the medial rectus toward the lateral rectus (Figure 2B). Second, and possibly as a consequence of lack of innervation of the medial rectus muscle, a shift of trigeminal nerve motor fibers to the medial rectus took place (Figure 2C), leading to a trigemino-oculomotor synkinesis between the lateral pterygoid or one of the suprahyoid muscles and the medial rectus. The slight narrowing of the palpebral fissure observed during sucking can be explained by synkinetic contraction of the medial muscle against a tight lateral rectus muscle in that specific situation, which led to discrete retraction of the globe.