Nerve supply of the eye

Nerve supply of the eye

The nerve supply of the eye involves sensory, motor, and autonomic (sympathetic & parasympathetic) nerves. Here’s a concise breakdown:


1. Sensory Nerve Supply

Nerve: Ophthalmic division of the Trigeminal nerve (CN V1)

Branches:

  • Nasociliary nerve

  • Frontal nerve

  • Lacrimal nerve

Function: Sensation from cornea, conjunctiva, sclera, eyelids, and orbit.


2. Motor Nerve Supply (Extraocular Muscles)


Muscle Nerve (Cranial Nerve)

Superior rectus - Oculomotor (CN III)

Inferior rectus   - Oculomotor (CN III)

Medial rectus.    -  Oculomotor (CN III)

Inferior oblique  -Oculomotor (CN III)

Superior oblique -Trochlear (CN IV)

Lateral rectus -Abducent (CN VI)


3. Autonomic Nerve Supply

Parasympathetic (CN III via ciliary ganglion):

  • Constriction of pupil (sphincter pupillae)

  • Accommodation of lens (ciliary muscle)

Sympathetic (from superior cervical ganglion):

  • Dilation of pupil (dilator pupillae)

  • Minor role in eyelid elevation (Müller’s muscle)


Summary Mnemonic


LR6 SO4, All others 3

(Lateral rectus → CN VI, Superior oblique → CN IV, all other extraocular muscles → CN III)


For further process click https://medorbis.ai


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