"The optic nerve is the second (CN II) cranial nerve (TA: nervus opticus or nervus cranialis II). It is a purely sensory nerve that conveys visual information from the eye to the brain."
Expected headings
"Intraocular segment"
"Intraorbital segment"
"Intracanalicular segment"
"Intracranial segment"
"Passes posteriorly and centrally within the orbit and is surrounded by dural lining and CSF; hence it directly communicates with the subarachnoid space and therefore allows transmission of increased pressure from hydrocephalus to manifest as papilloedema; additionally, the dural covering can develop a meningioma. It is approximately 25 mm in length 8."
"Passes posteriorly and centrally within the orbit and is surrounded by dural lining and CSF; hence it directly communicates with the subarachnoid space and therefore allows transmission of increased pressure from hydrocephalus to manifest as papilloedema; additionally, the dural covering can develop a meningioma. It is approximately 25 mm in length 8."
"type 1: most common (76%); the optic nerve is immediately adjacent to the lateral or superior wall of the sphenoidal sinus, without impression on the sinus wall"
"type 2: 15%; nerve causes an impression on the lateral sphenoidal sinus wall"
"type 3: 6%; nerve courses through the sphenoidal sinus rather than simply running adjacent to the sinus"
"type 4: 3%; nerve courses immediately lateral to the posterior ethmoidal and sphenoidal sinuses"