Equis ISSN 2398-2977

Auriculopalpebral nerve: perineural anesthesia

Contributor(s): Dennis E Brooks, Karen MacEachern, Graham Munroe, John Parker

Introduction

  • The orbicularis oculi muscle causes tight lid closure, especially in painful eye conditions, and eyelid akinesis or anesthesia may be essential for complete examination of the eye.
  • The auriculopalpebral nerve - a branch of the facial nerve - is a motor nerve supplying the upper eyelid and, in some horses, the lower eyelid as well.
  • When blocked, this allows manipulation of the eyelids without pressure on the painful eye.

Uses

  • To facilitate examination of the eye especially in painful conditions.
  • To control eyelid movement during minor surgical procedures.

Advantages

Disadvantages

  • The auriculopalpebral block is purely motor and does not remove sensation. Only the upper eyelid is consistently blocked.
  • The supraorbital, lacrimal, infratrochlear and zygomatic nerves require blocking to remove all periocular sensation.
  • Other regional blocks such as dorsal buccal nerve block (inject along facial crest) are required to remove all lower lid movement.

Requirements

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Preparation

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Procedure

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Michou J & Leece E (2012) Sedation and analgesia in the standing horse 2. Local anaesthesia and analgesia techniques. In Pract 34 (10), 578-587 VetMedResource.
  • Kafarnik C (2011) Periocular nerve blocks in horses. UK Vet 16, 9-12 VetMedResource.


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