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1 Bilateral Pseudo-abducens Palsies Due to Midbrain Stroke𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: This is a man who suffered right>left midbrain strokes due to endocarditis complaining of ptosis and inability to move his eyes as well as hallucinations (peduncular hallucinosis). There was a presumed nuclear 3rd nerve p...Image/MovingImage
2 Cavernous Sinus Mass Causing Right 3rd and 4th Nerve Palsies𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: 25-yo-man who complained of diplopia and was initially found to have right 4th and 6th nerve palsies in the setting of a right cavernous sinus mass (subsequently diagnosed as Ewing's sarcoma). When seen in follow-up (this...Image/MovingImage
3 Figure 64: The Course of the 3rd (III) NerveThe 3rd nucleus lies at the ventral border of the periaqueductal gray matter, at the level of the superior colliculus. In between the two nuclei is the midline central caudal nucleus (CCN), which innervates bilateral levator palpebrae muscles (explaining how a unilateral nuclear 3rd can cause bilate...Image
4 Brainstem Ocular Motor MachinerySeen here is a sagittal view of the brainstem. The medulla has a significant role in gaze-holding, and the nucleus prepositus hypoglossi (NPH, along with the medial vestibular nucleus ) is the horizontal neural integrator. The abducens (6th) nucleus is located in the dorsal pons, and sends off the 6...Image/MovingImage
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