У нас вы можете посмотреть бесплатно 2-Minute Neuroscience: Pupillary Light Reflex или скачать в максимальном доступном качестве, видео которое было загружено на ютуб. Для загрузки выберите вариант из формы ниже:
Если кнопки скачивания не
загрузились
НАЖМИТЕ ЗДЕСЬ или обновите страницу
Если возникают проблемы со скачиванием видео, пожалуйста напишите в поддержку по адресу внизу
страницы.
Спасибо за использование сервиса ClipSaver.ru
The pupillary light reflex controls the size of the pupil in response to light. When light is shined into one eye, both pupils constrict. In this video, I explain the anatomy and physiology underlying the pupillary light reflex. Learn more on my website: https://neuroscientificallychallenged... WATCH MORE • Reflexes | Neuroscientifically Challenged TRANSCRIPT The pupillary light reflex controls the size of the pupil in response to light. When light is shined into one eye, both pupils constrict. This reaction helps protect the retina from excessive light and optimizes visual acuity in varying levels of illumination. The reflex begins when light enters the eye and causes stimulation of the optic nerve, which carries information about light from the retina. The optic nerve becomes the optic tract, and a subset of optic tract neurons project to the pretectal area in the brainstem, where they synapse on neurons that extend to nuclei called the Edinger-Westphal nuclei. There is an Edinger-Westphal nucleus on each side of the brainstem, and these nuclei contain neurons that project through the oculomotor nerve to a structure called the ciliary ganglion. From there, the short ciliary nerves extend to the pupillary sphincter to constrict the pupil. Because the signal from the pretectal area is sent to both Edinger-Westphal nuclei, shining light into one eye results in pupillary constriction on both sides. The response in the stimulated eye is called the direct pupillary light reflex, and the response in the opposite eye is called the consensual pupillary light reflex. Clinically, the pupillary light reflex is used to assess the function of the optic and oculomotor nerves and related structures. For example, if light is shined into the right eye and neither pupil constricts, it suggests a deficit in sensory input and may indicate damage to the right optic nerve. But if light shined in the right eye causes only the left pupil to constrict, this indicates the sensory signal was received (since the left pupil constricted), but it may suggest a problem with the right oculomotor nerve, since the motor signal does not seem to be reaching the pupillary sphincter. REFERENCES Belliveau AP, Somani AN, Dossani RH. Pupillary Light Reflex. 2023 Jul 25. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–. PMID: 30725865. Purves D, Augustine GJ, Groh JM, Huettel SA, Lamantia AS, White LE, eds. Neuroscience. 7th ed. New York. Sinauer Associates; 2024. Vanderah TW, Gould DJ. Nolte's The Human Brain. 8th ed. Philadelphia, PA: Elsevier; 2021. 📝 Pass your next test with my neuroscience videos! I’m Marc, a university professor at Penn State, and I’m here to take you on a journey into the fascinating world of the brain. I created this channel to break down complex topics into easy-to-understand snippets—perfect for both students and curious minds alike. 📚 My goal is to make learning neuroscience fun and accessible. Whether you're a student looking to supplement your studies or simply eager to understand the basics of the brain, this channel is for you. Hit subscribe and get to know your brain, one video at a time! 🧠