| The nervous connections of this muscle are closely related to those of the extraocular muscle required to elevate the eye, so that when the eye looks upward the upper eyelid tends to move up in unison. |
| Rotation of the head in any direction is detected by the semicircular canals, and a velocity signal is then passed via the vestibular nuclei to the somatic and extraocular muscles. |
| It may be absent on one side, in which case the extraocular muscle usually innervated by the abducens is supplied by the oculomotor nerve. |
| Common signs and symptoms include diplopia, enophthalmos, infraortbital hypoesthesia, and decreased extraocular movements. |
| The treatment for intermittent exotropia is surgical, consisting of weakening and strengthening the appropriate extraocular muscles to realign the eyes. |
| In fact, the extraocular muscles do contain two types of muscle fibre with characteristically different nerve supplies, and some recent studies tend to support this view of a dual mechanism. |
