CONVERGENCE EXCESSES
\kənvˈɜːd͡ʒəns ɛksˈɛsɪz], \kənvˈɜːdʒəns ɛksˈɛsɪz], \k_ə_n_v_ˈɜː_dʒ_ə_n_s ɛ_k_s_ˈɛ_s_ɪ_z]\
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Disorders that feature impairment of eye movements as a primary manifestation of disease. These conditions may be divided into infranuclear, nuclear, and supranuclear disorders. Diseases of the eye muscles or oculomotor cranial nerves (III, IV, and VI) are considered infranuclear. Nuclear disorders are caused by disease of the oculomotor, trochlear, or abducens nuclei in the BRAIN STEM. Supranuclear disorders are produced by dysfunction of higher order sensory and motor systems that control eye movements, including neural networks in the CEREBRAL CORTEX; BASAL GANGLIA; CEREBELLUM; and BRAIN STEM. Ocular torticollis refers to a head tilt that is caused by an ocular misalignment. Opsoclonus refers to rapid, conjugate oscillations of the eyes in multiple directions, which may occur as a parainfectious or paraneoplastic condition (e.g., OPSOCLONUS-MYOCLONUS SYNDROME). (Adams et al., Principles of Neurology, 6th ed, p240)
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Hypoglossal Neuropathy
- twelfth cranial (hypoglossal) nuclei. fascicles are located in medulla, exits via hypoglossal foramen innervates muscles tongue. Lower brain stem diseases, including ischemia MOTOR NEURON affect nuclei fascicles. nerve may also be injured by diseases of the posterior fossa or skull base. Clinical manifestations include unilateral musculature and lingual dysarthria, with deviation tongue towards side weakness upon attempted protrusion.