Trochlear Nerve Disorder – Mnemonic

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Here is a quick mnemonic “OPTIC FIBER“ to remember about Trochlear Nerve Disorder

This can be valuable for patients as well as medical doctors, nurses & students doing their clinical rounds. You can also find it very useful for med exams like USMLE, MBBS, NEET PG, FMGE, NExT, MCAT & NCLEX exams

Trochlear Nerve Disorder : How To Remember Easily ?

  • O – Originates in the mid-brain, just caudal to the oculomotor nerve complex.
  • P – Principal actions involve depressing and intorting the globe.
  • T – Trochlear nerve palsy results in hypertropia and excyclotorsion.
  • I – Inhibited movement leads to vertical diplopia, especially when reading or looking down.
  • C – Complaints of vertical diplopia can be alleviated by tilting the head away from the affected muscle.
  • F – Fibers exit the brainstem dorsally and cross to innervate the contralateral superior oblique.
  • I – Injuries to the trochlear nerve commonly occur after closed head trauma.
  • B – Base-down prism can be used as a temporary measure to alleviate diplopia.
  • E – Eyes can be realigned by weakening the inferior oblique muscle.
  • R – Reviewing old photographs may reveal a habitual head tilt associated with trochlear nerve palsy.

Mnemonic : OPTIC FIBER

Dr. Arin Nandi

Passionate About Medical Science & Helping Future Doctors Achieve Top Ranks In Medical Exams. He is professionally a dentist as well as a public health expert from JIPMER (1), (2)working in health department
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