Regional anaesthesia of the equine head

Question 1

What are the 3 branches of the trigeminal nerve?

Answer 1

opthalmic
mandibular
maxillary

Question 2

What are the 5 sensory nerve blocks needed for surgeries of the periorbital surgery

Answer 2

supraorbital
lacrimal
Zygomatic
Infratrochlea
Retrobulbar

Question 3

Where is the supraorbital nerve found

Answer 3

comes out of supraorbital foramen

Question 4

Describe the techniques of retrobulbar nerve blocks

Answer 4

1. needle to back of horses eye (curve needle) - can potentially move cellular debris/bacteria to back of eye
2. go through supraorbital fossa

Question 5

Describe the route of the maxillary branch

Answer 5

Maxillary branch goes into maxillary foramen and comes out of infraorbital foramen (can block at either site)
Anaesthetise maxillary cheek teeth - anaesthetise nerve at maxillary foramen (just before eye)
Anaesthetise skin and muscle - anaesthetise at infraorbital foramen => sensory anaesthetisation

Question 6

Describe the anaesthetisation of the maxillary branch

Answer 6

Anaesthetise maxillary cheek teeth - anaesthetise nerve at maxillary foramen (just before eye) - blue
Anaesthetise skin and muscle - anaesthetise at infraorbital foramen => sensory anaesthetisation - red

Question 7

Describe the route of the mandibular branch

Answer 7

Mandibular branch - in through mandibular foramen and out of mental foramen

Question 8

Describe the anaesthetisation of the mandibular branch

Answer 8

Anaesthetise tooth roots/mandibular teeth - anaesthetise at mandibular foramen (inside jaw - triangulation used to find site)