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The Auditory Nervous System

The Auditory Nervous System. SPA 4302 Summer 2007. The Neuron. Generally: Dendrites receive stim. Creates ______________ Transmitted along axon Causes ____________ ____________ Stimulates new neuron. The Ascending Auditory Pathway. Primary Auditory Cortex. Medial Geniculate Body.

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The Auditory Nervous System

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  1. The Auditory Nervous System SPA 4302 Summer 2007

  2. The Neuron Generally: • Dendrites receive stim. • Creates ______________ • Transmitted along axon • Causes ____________ ____________ • Stimulates new neuron

  3. The Ascending Auditory Pathway Primary Auditory Cortex Medial Geniculate Body Inferior Colliculus Lateral Lemniscus Superior Olivary Complex Cochlear Nucleus VIIIth Nerve

  4. The Descending Auditory Pathways • ________________ Neurons • ______________ Neurons • Innervation of Middle Ear _____________

  5. Olivo-Cochlear Efferent Neurons

  6. Descending Pathways from Auditory Cortex

  7. Efferent Innervation of Tensor Tympani & Stapedius Muscles

  8. Development: VIIIth N. and Central Auditory Nervous System • VIIIth nerve initially: days 25 to 45 • Spiral Ganglion, Vestibular Ganglia identifiable by day 35 • Little else known about dev. of CANS

  9. Hearing Loss and the CANS • VIIIth N: some SNHL, some normal • ___________! • ___________ SNHL, Initially high frequency • Possibly poor Word Recognition • ___________ Nerve Symptoms • Disorders of the Auditory Nerve • Vestibular Schwannoma • _____________ • Multiple Sclerosis • Auditory Neuropathy: a new dx category • Normal ________, Abnormal _______

  10. Disorders of the Cochlear Nuclei • Kernicterus: • Result of Rh incompatibility • Hyperbilirubinemia • Cerebrovascular Accident: A brainstem stroke • Congenital trauma, malformation • Pressure (trauma, increased CSF pressure) • Syphilis • Aging

  11. Disorders of the Higher Auditory Pathways • Brainstem Tumors: • Intra-axial: contralateral or __________ deficits • Extra-axial: ____________ deficits • Higher level lesions • CVA/Stroke/Aneurysm • produce _____________ deficits

  12. Tests for Auditory Processing Disorder • ______________ • Filtered Speech • Speech with Competition • _____________ • Competing Sentence Tests • Dichotic Digits Test • Staggered _________ Word Test • Masking Level Difference Test

  13. Therapeutic Management • _____________ Modifications • Improve Signal To Noise Ratios • Pre-Teaching • ______________ Activities • Listening “Games” • Computer Based Auditory Training • ______________ Strategies • Homework Buddy

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