QS Study

The lacrimal gland is the main contributor to the aqueous layer of the tear film which consists of water, electrolytes and proteins. They are serous type exocrine glands that secrete lacrimal fluid onto the surfaces of the conjunctiva and cornea of the eye. It lies in the superolateral aspect of the orbit. The lacrimal glands secrete tears which act to lubricate and protect the cornea and eyeball from injury which may result from small particles such as dust.

Nerve Supply of Lacrimal Gland –

The greater petrosal nerve, derived from the facial nerve, supplies the parasympathetic autonomic component of the lacrimal gland.

(A) Pathway of the secretomotor fibre of lacrimal gland (Parasympathetic fibres are secretomotor)

  • The preganglionic fibres in the lacrimatory nucleus (lower pons)
  • Through nerves intermedius
  • The geniculate ganglion
  • The greater petrosal nerve
  • The nerve of the pterygoid canal
  • The pterygoid ganglion
  • The zygomatic nerve
  • The zygomaticotemporal nerve
  • A communicating branch to the lacrimal nerve
  • Lacrimal nerve
  • Lacrimal gland.

Nerve Supply Pathway of Lacrimal Gland 1

Fig: Lacrimal Gland

(B) Pathway of the sympathetic fibre of lacrimal gland

  • The sympathetic postganglionic fibre
  • Travel internal carotid plexus
  • The deep petrosal nerve
  • The nerve of the pterygoid canal
  • The maxillary nerve
  • The zygomatic nerve
  • The zygomaticotemporal nerve
  • Lacrimal nerve
  • Lacrimal gland.
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