What is an oculomotor nerve?

Oculomotor nerve is the third cranial nerve that stimulates motor function. There are 12 cranial nerves that control the motor and sensory processes of the head and neck. The eyepiece nerve controls the muscles that regulate all eye movements except the eyeballs down or out. The core of this nerve consists of many small cores that are divided into front and rear groups. These groups can be further divided into cellular groups that control individual muscles.

The eyepiece nerve is connected to the two cores in the midbrain: October nucleus and Edinger-Westphal nucleus. The eyepiece core is a source of somatic fibers to the muscles of the rectic, the lower oblique muscle and the levator Palpebrae Superious Muscle. These muscle groups control different eye movements. Edinger-Westphal Nucleus projects fibers to ciliary ganglion, a structure located in the back orbit, where the sensory processes, narrowing of pupils, dilation and blood vascular are activity.

From the brain stem, the oxotor nerve enters the dura of the material, the heaviest layers of three membranes that surround the brain and spinal cord. It lies on the wall of the cavernous sinus, the compartment of the veins located in the head and enters the orbit through the orbital crack, the space between the floor and the wall of the orbit, which serves as a movement channel for nerves and blood vessels. The eyepiece nerve carries parasympathetic fibers that slow down heart rate and allow action such as digestion. These fibers are transmitted to the pupil and muscle, which is responsible for increasing the lid.

Oculomotor nerve fibers are based on the core in the floor aqueduct floor. Their journey includes browsing through the floor of the middle mobran, known as the Tegmentum, the Red Core and the Nigra Substantia, the structure located in the midbrain that controls the reward of addiction. The fibers eventually end up in the middle of the brain stop, which is half the midbrain, after emerging from the side wall of the middle mobran, known as the oculomotorSulcus.

Oculomotor nerves consist of two components: somatic engine and visceral engine. Somatic motor components are responsible for accurate eye movements such as monitoring and fixation on a particular object. Visceral motor components process light and accommodation reflexes, mostly related to the pupil. Four of the six extraocular muscles, those that control the eye movement, are supplied by somatic motor components, as well as the Levator Palpebrae Superirioris, which controls the movement of the upper eyelid. The visceral components of the engine control the nerve inlet of the pupil muscles and the lens of the eye lens.