1. The Auditory Nervous System
SPA 4302
Summer 2007

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

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

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

6. Olivo-Cochlear Efferent Neurons
Map of Auditory Efferents

7. Descending Pathways from Auditory Cortex
Descending neurons from Auditory Cortex, MGB, and IC

8. Efferent Innervation of Tensor Tympani & Stapedius Muscles
Innervation of middle ear musculature.

9. 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

10. 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 _______

11. 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

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

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

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