extorsion

extorsion /ex·tor·sion/ (eks-tor´shun) outward rotation of the upper pole of the vertical meridian of each eye.

---

ex·tor·sion (k-stôrshn)

n.

1. The outward rotation of a limb or organ.

2. The outward divergent rotation of the upper poles of the vertical meridian of the cornea of each eye. Also called disclination, positive declination.

---

extorsion

rotation of the pupil, observed only in animals with horizontal pupils such as cattle and sheep. Caused by paralysis of the dorsal oblique muscle, as seen in polioencephalomalacia of ruminants.