Zygomatic nerve

Not to be confused with zygomatic branches of the facial nerve.

Zygomatic nerve
Lateral view of the nerves of the orbit. The zygomatic nerve is visible at bottom centre branching from the maxillary nerve.
Details
From	Maxillary nerve
To	Zygomaticotemporal nerve zygomaticofacial nerve communicating branch to lacrimal nerve
Innervates	Skin over temporal bone and zygomatic bone
Identifiers
Latin	nervus zygomaticus
TA98	A14.2.01.056
TA2	6231
FMA	52967
Anatomical terms of neuroanatomy [edit on Wikidata]

The zygomatic nerve is a branch of the maxillary nerve (itself a branch of the trigeminal nerve (CN V)). It arises in the pterygopalatine fossa and enters the orbit through the inferior orbital fissure before dividing into its two terminal branches: the zygomaticotemporal nerve and zygomaticofacial nerve.

Through its branches, the zygomatic nerve provides sensory invervation to skin over the zygomatic bone and the temporal bone. It also carries post-ganglionic parasympathetic axons to the lacrimal gland.

It may be blocked by anaesthetising the maxillary nerve.

Structure

Origin

The zygomatic nerve is a branch of the maxillary nerve (CN V₂).^[1][2] It arises at the pterygopalatine ganglion.^[1]

Course

It exits from the pterygopalatine fossa through the inferior orbital fissure to enter the orbit.^[1][3] In the orbit, it travels anteriorly along its lateral wall.^[3]

Branches

Soon after the zygomatic nerve enters the orbit, it divides into its branches. These include:

• Zygomaticotemporal nerve^[1]
• Zygomaticofacial nerve^[1]
• A communicating branch to lacrimal nerve^[1]

Variation

Sometimes, the zygomatic nerve does not branch within the orbit. Instead, it enters a single foramen in the zygomatic bone called the zygomatico-orbital foramen. In this case, it divides within the bone into the zygomaticotemporal nerve and the zygomaticofacial nerve.^[4]

Function

The terminal branches of the zygomatic nerve contain sensory axons.^[1] These provide sensation to the skin over the temporal bone and the zygomatic bone.^[4]

The zygomatic nerve also carries postganglionic parasympathetic axons.^[1] These axons have their cell bodies in the pterygopalatine ganglion. They travel from the ganglion to the zygomatic nerve, and then to the lacrimal nerve through a communicating branch. From the lacrimal nerve, they enter the lacrimal gland and provide secretomotor supply.^[5]

Clinical significance

The zygomatic nerve can be blocked indirectly by anaesthetising the maxillary nerve (CN V₂).^[2] The zygomatic nerve and its branches may be damaged by a fracture to the zygomatic bone.^[6]

Additional images

• 
  The nerves of the scalp, face, and side of neck.
• 
  Branches of the trigeminal nerve. The zygomatic nerve is visible branching from the maxillary nerve and entering the orbit.

References

1. Rea, Paul (2016). "2 - Head". Essential Clinically Applied Anatomy of the Peripheral Nervous System in the Head and Neck. Academic Press. pp. 21–130. doi:10.1016/B978-0-12-803633-4.00002-8. ISBN 978-0-12-803633-4.
2. Pai, Umeshraya T.; Nayak, Rajeshri; Molloy, Robert E. (2005). "72 - Head and Neck Blocks". Essentials of Pain Medicine and Regional Anesthesia (2nd ed.). Churchill Livingstone. pp. 598–606. doi:10.1016/B978-0-443-06651-1.50076-9. ISBN 978-0-443-06651-1.
3. Forrester, John V.; Dick, Andrew D.; McMenamin, Paul G.; Roberts, Fiona; Pearlman, Eric (2016). "1 - Anatomy of the eye and orbit". The Eye - Basic Sciences in Practice (4th ed.). Saunders. pp. 1–102. doi:10.1016/B978-0-7020-5554-6.00001-0. ISBN 978-0-7020-5554-6.
4. Standring, Susan, ed. (2016). Gray's anatomy : the anatomical basis of clinical practice (41 ed.). Philadelphia: Elsevier. ISBN 978-0-7020-5230-9. OCLC 920806541.
5. Anderson, B. C.; McLoon, L. K. (2010). "Cranial Nerves and Autonomic Innervation in the Orbit". Encyclopedia of the Eye. Academic Press. pp. 537–548. doi:10.1016/B978-0-12-374203-2.00285-2. ISBN 978-0-12-374203-2.
6. Gellrich, Nils-Claudius Bernhard; Zimmerer, Rüdiger M. (2017). "7 - Surgical Management of Maxillary and Zygomatic Fractures". Maxillofacial Surgery. Vol. 1 (3rd ed.). Churchill Livingstone. pp. 93–132. doi:10.1016/B978-0-7020-6056-4.00007-1. ISBN 978-0-7020-6056-4.