Extraocular Muscle Actions & Clinical Testing
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Extraocular Muscle Actions & Clinical Testing
What about clinical testing of extraocular muscle function & associated nerve integrity?
Adduction (~51°), produced by the medial rectus, aligns the optical axis with the line of pull for the superior & inferior obliques muscles. In this position...
 - only the inferior oblique produces elevation 
 - only the superior oblique produces depression
Abduction (~23°), produced by the lateral rectus, aligns the optica axis with the line of pull for the superior & inferior rectus muscles. In this position...
 - only the superior rectus produces elevation
 - only the inferior rectus produces depression
Nerve Palsies:
 • CN Ill: ptosis, mydriasis, eye position "down & out"
 • CN IV: vertical or torsional diplopia
 • CN VI: inability to abduct eye

by Mikaela Stiver @MikaelaStiver

#Extraocular #Muscle #Actions #diagnosis #testing #ophthalmology
Contributed by

Dr. Gerald Diaz
@GeraldMD
Board Certified Internal Medicine Hospitalist, GrepMed Editor in Chief 🇵🇭 🇺🇸 - Sign up for an account to like, bookmark and upload images to contribute to our community platform. Follow us on IG:  https://www.instagram.com/grepmed/ | Twitter: https://twitter.com/grepmeded/
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