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Vocal Fold Essay

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Neurogenic voice disorders is a paresis or paralysis in the vocal folds due to damage to the peripheral nervous system (PNS) or the central nervous system (CNS). A vocal fold paralysis is the inability to move one or both of the vocal folds due to the lack of innervation of intrinsic laryngeal muscles. Vocal fold paralysis in neurogenic voice disorders results in unilateral or bilateral vocal fold paralysis. Vocal fold paralysis or paresis in neurogenic disorders can result from birth, injury, disease, or illness to the neurological systems associated with voice production, such as the following: viral infection, Cerebral Vascular Accident (CVA), Traumatic Brain Injury (TBI), recurrent laryngeal nerve damage, tumor, or idiopathic (unknown …show more content…
These characteristics include the following: breathiness, hoarseness, diplophonia, decreased pitch range, and an inability to increase loudness. Additional signs and symptoms of vocal fold paralysis are choking or coughing during swallowing, noisy breathing, and ineffective cough. Vocal fold paralysis in neurological disorders can be peripheral or central. In other words, paralysis in the vocal folds are caused from lesions along the superior laryngeal nerve (SLN) or recurrent laryngeal nerve (RLN). In most cases, vocal fold paralysis is caused from peripheral lesions. The central nervous system (CNS) and the peripheral nervous system (PNS) coordinate laryngeal functions, which includes the evaluation of the larynx for swallowing, tri-level valve closure required for coughing, and vocal fold vibrations for speech. The CNS as it pertains to voice includes the following: brain, spinal cord, pyramidal tracts, extrapyramidal tracts, thalamus, internal capsule, and the basal ganglia, neurotransmitters, brainstem, and cerebellum. “The sensory and motor areas within the cerebral cortex, cerebellum, and basal ganglia contribute to production of voice.” (Loucks and colleagues, 2007; Simonyan and Horwitz,

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