Abducens nerve

02-09-2009
Abducens nerve

 


  Abducens motor nerve, innervates the lateral rectus muscle eye. By connecting the branches in the trunk of the nerve included autonomic and sensory fibers. 

Abducens nucleus (nucl. abducens), which consists of large efferent nerve cells located in the tires (tegmentum) bridge at the bottom of the IV ventricle, near the middle 
line, more kperetsi. 

The trunk of the nerve leaves the brain at the posterior edge of the bridge between him and the pyramid of the medulla oblongata. Then enters from the back outside the sella turcica in the cavernous sinus, where pacpolagaetsya on the outer surface of the internal carotid artery. Then through the upper orbital fissure it penetrates into the orbit and is moving forward on the orbital nerve. In the cavernous sinus to the nerve connecting the branches of suitable plexus internal carotid artery, containing sympathetic nerve fibers. Abducens nerve is unnerving abducens. 

  Symptoms defeat 
  Abducens nerve differs most sensitive compared with other oculomotor nerve injury, to an increase in intracranial pressure. Affects the nerves more often on the basis of the brain. 

The proximity of abducens and trigeminal nerve root to the posterior surface of the pyramid of the temporal bone facilitates the transition to their process of the middle ear and the emergence of Gradenigo syndrome, characterized by a purulent otitis media and shooting pain in visochnotemennoy area, abducens paresis (described by an Italian physician G. Ggadenigo in 1904 .) restricted movement of the eye outwards. 

Abducens nucleus lies close to the motor, sensitive ways, so often seen their combined failure. Thus, because of the proximity to 
supranuklearnomu center of gaze may be a combination of paralysis of gaze to the right (left) with paralysis abdutsensa toyzhe side.


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