If there is an inability to move the eye laterally, it indicates a problem with the lateral rectus muscle and abducens nerve (VI). The lateral rectus muscle is responsible for outward eye movement, while the abducens nerve controls the lateral rectus muscle. Therefore, if there is an issue with either the muscle or the nerve, lateral eye movement will be affected.
In contrast:
- The medial rectus muscle and abducens nerve (VI) are responsible for inward eye movement, not outward.
- The trochlear nerve (IV) is associated with the superior oblique muscle, which helps with downward and inward eye movement.
- The oculomotor nerve (III) controls multiple eye muscles, including the inferior oblique muscle for upward and outward eye movement.
