Comparative Neuro-Ophthalmology - North Carolina State ...

Horner’s Syndrome in Large Animals• signs more subtle than dogs/cats• ptosis most consistent finding, miosis inconsistent• ipsilateral cutaneous facial and cervical hyperthermia• cattle = ipsilateral lack of sweating (anhydrosis, detectedin nose), vascular engorgement of pinna (sweatingmediated by alpha adrenegic receptors)• horse = ipsilateral facial sweating (vasodilatation andincreased blood flow from decreased vasomotor tonus)- entire ipsilateral head and body = first order lesion- ipsilateral head and neck = second or third order lesion