2 doctors weighed in:

Action of superior oblique eye muscle is down and out, but h test diagram show so down and in. Why the seeming discreptancy?

2 doctors weighed in
Dr. Michael Jaindl
ENT - Head & Neck Surgery
1 doctor agrees

In brief: The SO has...

Maximum depression when the lr is contracted.
However its pure function is internal rotation, therefore if cn 4 were out only the so would be out. This would eliminate internal rotation that could not be compensated by medial rectus and inferior rectus.

In brief: The SO has...

Maximum depression when the lr is contracted.
However its pure function is internal rotation, therefore if cn 4 were out only the so would be out. This would eliminate internal rotation that could not be compensated by medial rectus and inferior rectus.
Dr. Michael Jaindl
Dr. Michael Jaindl
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