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Ophthalmology Pupillary Reflexes and their Abnormalities 389ad640

Following is true about oculocardiac reflex except -

A
It is also called aschner phenomenon
B
It is mediated by occulomotor and vagus nerve
C
It is characterized by bradycardia following traction on extra-ocular muscles
D
Reflex is more sensitive in neonates
High-Yield Explanation
Ans. is 'b' i.e., It is mediated by occulomotor and vagus nerveOculocardiac reflexo Oculocardiac reflex, is also known as Aschner phenomenon, Aschner reflex, or Aschner-Dagnini reflex,o It is characterized bv decrease in pulse rate (bradycardia) associated with traction applied to extraocuiar muscles and/or compression of the eyeball.o The reflex is mediated by nerve connections between the ophthalmic branch of the trigeminal cranial nerve via the ciliary ganglion, and the vagus nerve of the parasympathetic nervous system,o This reflex is especially sensitive in neonates and children, particularly during strabismus correction surgery. However, this reflex may also occur writh adults.o Bradycardia, junctional rhythm and asystole, all of w hich may be life-threatening,can be induced through this reflex.

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