Mechanical nociceptive thresholds of dorsal laminae in horses after local anaesthesia of the palmar digital nerves or dorsal branches of the digital nerve

•The role of the palmar digital nerves in dorsal hoof wall laminae sensation was in doubt.•Laminar mechanical nociception was evaluated with or without perineural anaesthesia in clinically normal horses.•The palmar digital nerves are primarily responsible for dorsal laminar innervation. We examined...

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Bibliographic Details
Published in:The veterinary journal (1997) 2016-08, Vol.214, p.102-108
Main Authors: Paz, C.F.R., Magalhães, J.F., Mendes, H.M.F., Rocha Junior, SdS, Belknap, J.K., Alves, G.E.S., Faleiros, R.R.
Format: Article
Language:English
Subjects:
Anesthesia, Local - veterinary
Anesthetics, Local - administration & dosage
Animals
Cross-Over Studies
Diagnostic analgesia
Equine
Female
Foot
Foot - physiology
Hoof and Claw - innervation
Horses - physiology
Lameness
Nociception - drug effects
Pain
Pain - veterinary
Peripheral Nerves - physiology
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Summary:•The role of the palmar digital nerves in dorsal hoof wall laminae sensation was in doubt.•Laminar mechanical nociception was evaluated with or without perineural anaesthesia in clinically normal horses.•The palmar digital nerves are primarily responsible for dorsal laminar innervation. We examined the hypothesis that the palmar digital nerves (PDNs), but not the dorsal branches (DBs) of the digital nerves, innervate the sensitive dorsal laminae of the equine foot by evaluating the effects of perineural anaesthesia of the PDNs and DBs separately on pain sensation evoked via mechanical stimulation of the dorsal laminae and other regions of the equine foot. Six clinically normal mares were used in a crossover design. A portable dynamometer was used to evaluate mechanical nociceptive thresholds at different points on the dorsal laminae, bulbs of the heel, coronary band and sole before and after the horses underwent perineural injection of PDNs or DBs with a local anaesthetic solution (treated group) or an isotonic saline solution (control group). Cornified tissue was removed from the sole and the dorsal aspect of the hoof wall before evaluations of mechanical nociceptive thresholds. Anaesthetising PDNs distal to the DBs increased mechanical nociceptive thresholds compared to baseline values (P 
ISSN:1090-0233
1532-2971
DOI:10.1016/j.tvjl.2016.05.005