Pupillary dark reflex anatomy

The pupillary dark reflex is the opposite of the pupillary light reflex. Both make use of the same light sensors and the optic nerve, but the dark reflex makes use of the sympathetic nervous system to dilate the pupil whereas the light reflex triggers parasympathetic neurones to constrict the pupil. Sympathetic nerves come from the thoracic spinal cord, so what is the anatomy of this reflex and how might this link problems with the eye to pathology in the chest or neck?
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[@phelinasmith2195]

Dear Sam Webster, you have helped improve my quality of life in seven month more so than my 40+ years experience with healthcare. My sincere appreciation for all your work. Excellent❤

[@vsrump]

wow! amazingly intricate reflex brilliantly presented , w/ clinical pearls included …fantastic 👍
thank you !!

[@atomoyoga]

The ocular system is amazing. So many things we do not know yet. So related with the autonomous nervous system and also with the brain. I a doing a research myself with Complutense University of Madrid, The extra ocular and the adaptive muscles of the eye and misuse of electronic divises (cell phones and computers). ❤ this is gold for my research . Thank you so much for these several videos about reflexes.

[@smadaf]

In any of your videos do you talk about the systems that move our eyes when we sleep (rolling back generally, moving fast when we dream) and when we die?

[@Montypython7777]

Interesting and informative as usual. Keep at it please. Love it!

[@mahmoudfarouk7876]

nice

[@RahulMeena-zt1py]

Sir please also teach histo and embryo

[@zez3419]

🫀

[@astrofootballmedia]

Sam
I provide professional services in THUMBNAIL DESIGN /EDITING. Open to collaboration? 🎬✨