10/04/2025
Oculomotor Nerve ⚡️
👁️ The oculomotor nerve (Cranial Nerve III) controls most of the muscles responsible for eye movement — helping you look up, down, and inward. It also lifts your eyelid and constricts your pupil to adjust to light.
🧠 It originates in the midbrain, travels through the cavernous sinus, and enters the orbit via the superior orbital fissure — branching out to control multiple eye muscles and the ciliary ganglion for pupil constriction.
⚠️ Damage can lead to drooping eyelids (ptosis), double vision (diplopia), and a dilated pupil that doesn’t respond properly to light. The affected eye may also deviate “down and out” due to unopposed action of other eye muscles.
🤓 Fun fact:
The oculomotor nerve not only helps you move your eyes but also plays a crucial role in the “pupillary light reflex” — that automatic reaction your pupils have when a bright light hits your eyes!
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