The muscles of the eye are the inferior oblique muscle group, the most extensive in the human facial apparatus. Available in humans, reptiles and birds. They are attached to the outer edge of the orbit or to the frontal bone, running more or less parallel to the skin, occupying a large space in the orbit. In chordates, which have obliquely inclined ocular muscles, the muscles are often divided into two separate groups: the abductor inferior rectus muscle and the abductor lateral cutaneous muscle. There is no unpaired muscle of the posterior longitudinal direction as such; it is represented by paired muscles that are attached either to the anterior edges of the vertical superior and inferior rectus muscles, or to the frontal bones, due to which they retain contractility in cases where these muscles completely lose functionality. In almost all groups of animals there are also no cheek muscles (without them the sea monkey lemur and the char fish, as well as 309 other species of all fish). To keep the gaze motionless, the muscle pulls one eye towards the other. An example of how the oblique muscles work is strabismus - that is, inappropriate rotation of one eye relative to the other in the absence of deviations in the shape of the eyeball. The cause of this condition occurs when one or more of these eye muscles become functionally weak. The muscle fibers passing through the block are relaxed and are unable to completely keep one eye still while trying to fixate on the other. The optic nerve in this