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Encyclopedia > Abducent nerve

The sixth out of twelve cranial nerves, the abducens nerve controls the lateral rectus muscle - this means that the action of this nerve controls each eye's ability to look laterally (away from the midline).


The abducens nerve emerges from the brainstem between the pons and the medulla, and exits the skull through the superior orbital fissure (one of the holes in the skull behind the eye).


Looking for a 6th nerve palsy is a good screening sign in children with suspected meningitis. As the abducens emerges near the bottom of the brain, it is often the first nerve compressed when there is any rise in intracranial pressure.






  Results from FactBites:
 
IX. Neurology. 1F. The Abducent Nerve. Gray, Henry. 1918. Anatomy of the Human Body. (619 words)
The abducent nerve is joined by several filaments from the carotid and cavernous plexuses, and by one from the ophthalmic nerve.
As these nerves pass forward to the superior orbital fissure, the oculomotor and ophthalmic divide into branches, and the abducent nerve approaches the others; so that their relative positions are considerably changed.
Below the optic nerve are the inferior division of the oculomotor, and the abducent, the latter lying on the medial surface of the Rectus lateralis.
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