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Cranial nerve damage - Learning Issue Cranial nerve...

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Learning Issue: Cranial nerve damage-MH I have included a picture of the foramens and associated cranial nerve orientation. Below I have also included a table from MDconsult in reference to normal function and pathologic considerations. I did not look specifically for each nerve, and specifically where a lesion may occur, as I feel like CABS more or less covers how to differentiate UMN and LMN lesions, however this should help us orient the bony anatomy pathology in relation to nerve involvement. Table 103-1 -- The Cranial Nerves: Normal Function and Pathologic Considerations CRANIAL NERVE CLINICAL FUNCTION RELEVANT TO EMERGENCY MEDICINE PATHOLOGIC FEATURES POSSIBLE CAUSES Cranial nerve I: Olfactory nerve Sense of smell Unilateral anosmia Trauma : Skull fracture or shear injury interrupting olfactory fibers traversing the cribriform plate Tumor : Frontal lobe masses compressing the nerve Cranial nerve II: Optic nerve Vision Unilateral vision loss Trauma : Traumatic optic neuropathy Tumor : Orbital compressive lesion Inflammatory : Optic neuritis (MS) Ischemic : Ischemic optic
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CRANIAL NERVE CLINICAL FUNCTION RELEVANT TO EMERGENCY MEDICINE PATHOLOGIC FEATURES POSSIBLE CAUSES neuropathy Cranial nerve III: Oculomotor nerve Extraoculomotor function via motor fibers to levator palpebrae, superior rectus, medial rectus, inferior rectus, inferior oblique muscles Pupillary constriction via parasympathetic fibers to constrictor pupillae and ciliary muscles Ptosis caused by loss
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