Optometry Club - A.K.D

✅ Nerve Supply of the Human Eye 👁️
The nerve supply of the eye is divided into Sensory, Motor, Parasympathetic, and Sympathetic supply.

🔶 1. Sensory Supply (General Sensation)

Supplied by Trigeminal nerve
Mainly through Ophthalmic division (V1) → Nasociliary nerve.

🔹 Long Ciliary Nerves supply:

• Cornea (very sensitive)
• Iris
• Ciliary body

👉 Responsible for pain, touch, and corneal reflex (afferent limb)

🔶 2. Motor Supply (Extraocular Muscles)

🔹 Supplied by Oculomotor nerve
* Superior re**us
* Inferior re**us
* Medial re**us
* Inferior oblique
* Levator palpebrae superioris

🔹 Supplied by Trochlear nerve
• Superior oblique
🔹 Supplied by Abducens nerve
• Lateral re**us

👉 Mnemonic: ⭐ LR6 SO4 — Rest by 3

🔶 3. Parasympathetic Supply (Pupil Constriction & Accommodation)

Origin: Edinger-Westphal nucleus

Pathway:
Via Oculomotor nerve → Ciliary ganglion → Short ciliary nerves

🔹 Functions:
👉 Sphincter pupillae → Miosis (pupil constriction)
👉 Ciliary muscle → Accommodation (near vision)

🔶 4. Sympathetic Supply (Pupil Dilatation)
Origin: Hypothalamus → Spinal cord (T1–T2)
Synapse in Superior cervical ganglion
Travel via carotid plexus → Long ciliary nerves

🔹 Functions:
👉 Dilator pupillae → Mydriasis (pupil dilatation)
👉 Supply to Müller’s muscle (helps eyelid elevation)
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