The ocular-cephalic reflection is a vestibular-eyepiece reflection mediated by vestibular nuclei, allowing you to keep your eyes fixed while rotating your head, operating a lateral conjugate deviation of the ocular globes in the opposite direction to the rotation of the head. p> Physiologiamodifica wikitesto
The head rotation is captured by internal ear receptors: the uterus, saccharus and ampoules ridges of the three semicircular channels that are reached by peripheral fibers of the vestibular ganglion of Scarpa, attached to the vestibolococlear nerve ( VIII cranial nerve). The signal travels centrally to the four vestibular nuclei (upper, lateral, medial, lower) present in the bulb of the trunk of the brain. From the vestibular nuclei, fibers that, through the medial longitudinal dosage, reach the sumo motors of the three oculomotor nerves: the oculomotor nerve (III cranial nerve), the thrombotic nerve (IV cranial nerve) and the abductive nerve (VI nerve cranial) , responsible for the movements of the ocular globe. Thus, head movements cause the onset of action potentials in the three oculomotor nerves, which adjust the position of the ocular globes to allow the gaze to be fixed. Meaning clinicomodifica wikitesto
In coma subjects, the so-called "doll eye maneuver" is performed to evaluate the integrity of the trunk of the brain: the patient in the supine position takes his head and turns it upwards, downwards, towards left and right. If there is no injury to the brain, the reflection is present, and even if comatose, the patient moves eyeballs and keeps their eyes fixed (positive doll eye maneuver). If there is an injury to the brain, the comatose patient can not hold the eye on a point (Negative Doll Eye Maneuvering).
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