Overview
Clinical Meaning
The comprehensive neurological examination systematically evaluates the functional integrity of the nervous system from cortex to peripheral nerve, with each component designed...
The comprehensive neurological examination systematically evaluates the functional integrity of the nervous system from cortex to peripheral nerve, with each component designed to localize pathology to a specific anatomical level. Mental status testing (orientation, attention, memory, language, visuospatial function) evaluates cerebral cortical function — the Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) provide standardized screening. Cranial nerve examination tests brainstem function: CN II (visual acuity, fields, pupillary light reflex testing the afferent limb via the optic nerve and efferent limb via CN III parasympathetics), CN III/IV/VI (extraocular movements — CN III palsy produces ptosis, mydriasis, and 'down and out' eye position from unopposed lateral rectus and superior oblique), CN V (facial sensation and masseter strength), CN VII (facial motor — upper motor neuron lesion spares the forehead due to bilateral cortical innervation, while lower motor neuron lesion affects the entire hemiface), CN VIII (hearing — Weber lateralizes to the affected ear in conductive loss, to the unaffected ear in sensorineural loss), CN IX/X (gag reflex, palate elevation), CN XI (trapezius and sternocleidomastoid strength), and CN XII (tongue protrusion...