Optic Nerve// by Shivani Rae// The optic nerves are solely sensory. #Repost @soton_brain_hub They convey visual information from each retina out of the eye and into the skull through the optic canals. The left and right optic nerves meet to form the optic chiasm, where fibres from the nasal half of each retina cross over. The optic tract continues to the lateral geniculate nucleus in the thalamus, from where optic radiations fan out to the primary visual cortex in the occipital lobe. The visual pathway is a useful diagram to be able to draw as it allows you to figure out where a lesion is when presented with a visual field deficit. Just shade in the parts of the visual field that are lost and track along the pathway to find the lesion! Using this method you can see for yourself how bitemporal hemianopia (bilateral loss of the temporal visual field) is most likely caused by damage at the optic chiasm. Enlargement of which nearby structure may be responsible for compression of the optic chiasm? #opticnerve #visualpathway #vision #nlm2 #nlm2soton #12days #12nerves #neuro #neuroanatomy #anatomy #clinicalanatomy #medstudent #medschool #medicina #neuroscience #clinical #neurosurgeryblog #neurocirurgiabr
