Mechanical nociceptive thresholds of dorsal laminae in horses after local anaesthesia of the palmar digital nerves or dorsal branches of the digital nerve
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Universidade Federal de Minas Gerais
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Mechanical nociceptive thresholds of dorsal laminae in horses after local anaesthesia of the palmar digital nerves or dorsal branches of the digital nerve
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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 < 0.001) at sites assessed in the dorsal laminae, sole, and the bulbs of the heels. Anaesthetising
DBs increased mechanical nociceptive thresholds compared to baseline values (P < 0.01) only at sites assessed
at the most proximal aspect of the foot (i.e., coronary band sites). In conclusion, PDNs, not DBs,
are primarily responsible for pain signal transmission evoked by pressure in the dorsal laminae of the
foot of clinically normal horses.
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Ciência animal
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Equino, Cavalo