ⓘ Fourth nerve palsy

                                     

ⓘ Fourth nerve palsy

Fourth cranial nerve palsy, is a condition affecting cranial nerve 4, the trochlear nerve, which is one of the cranial nerves. It causes weakness or paralysis of the superior oblique muscle that it innervates. This condition often causes vertical or near vertical double vision as the weakened muscle prevents the eyes from moving in the same direction together.

Because the trochlear nerve is the thinnest and has the longest intracranial course of cranial nerves, particularly vulnerable to injuries.

To compensate for double vision, arising from weakness of the superior oblique, patients characteristically tilt your head down and to the side opposite the affected muscle.

When present at birth it is called congenital fourth nerve.

                                     
  • For acquired fourth nerve palsy see fourth nerve palsy Congenital fourth nerve palsy is a condition present at birth characterized by a vertical misalignment
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  • Bell s Palsy Facial Nerve Problems Symptoms, Treatment Contagious Shevell, Michael 19 December 2018 Cerebral palsy to cerebral palsy spectrum
  • oblique Palsy Congenital fourth nerve palsy Inferior oblique overaction Brown s syndrome Duane s retraction syndrome Double elevator palsy Fibrosis
  • M. Parks. Yeung, Pauline HN Lam, Andrew KC 10 September 1998 Fourth nerve palsy with monovision Clinical and Experimental Optometry. 81 5 206 209
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