What is the third skull nerve?

The third skull nerve is an oculomotor nerve that is largely responsible for most of the eye movements. Specifically, they control the altitude of the eyelids; up, down and side movement of the eyes; turning the eyes; lens thickening; and dilatation of pupils. Damage or paralysis of a third skull nerve leads to a loss of one or a combination of these movements. It has two nuclei: the oculomotor nucleus found in the superior Colliculi and Edinger-Westphal core located behind the oculomotor nucleus. Each core innervates a separate set of muscles involved in the eye movement. It controls the levator Palpebrae Superioris, which is the muscles that moves the upper cap up. They also control several muscles that move the eyeball itself: excellent, media and lower rectus muscles Adoly oblique muscle muscles. On the other hand, the media rectus muscle is predominantly responsible for the intor. The lower rectus muscle, when it is innervated by the third skull, controls the rotation of the eyeball and the expansion and kidnapping that both shift the eye from the middle line. The lower oblique muscle helps in expanding, kidnappingU and rotation of the eyeball.

6 Inveres the papals of the sphincter that controls the expansion of the pupils. He is also responsible for the reflex accommodation, in which the movement of the eyes, the shape of the lens and the size of the pupil is ready to focus on the eye on a nearby object.

The only two orbital eye muscles that are not innervated by the third skull are the side rectus muscle and superior oblique muscle. These two muscles are checked by other paired nerves: Abducens nerve and trochlear nerve. Side rectus muscle turns the eye from the middle line of the body; And the excellent oblique muscle helps to rotate the eye in, out and down.

Damage to the third cranial nerve can lead to a form of paralysis known as ocular motor nerve polio polio. Depending on the severity of the damage, one eye could not move from its current position or both eyes may not move from its current position. Complete nerve damage will result in permanent rotation of eye bUlva down, expansion of the affected pupil and spoiled lid.