General cochlear anatomy - Faculty web pages

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Peripheral Innervation:SUMMARY OF COCHLEAR INNERVATIONAll fiber loose myelin sheaths as they enter O of C.(1) Radial Fibers (a) to IHC and (b) tunnel crossing radialfibers to OHC.(2) Internal Spiral Bundle(3) Tunnel Spiral Fibers(4) Outer Spiral FibersAfferent and EfferentFig. 17.Schematic representation of different groups of nerve fibers in the organof Corti. The efferents are drawn in black. D : radial fibers to inner haircells; iS : internal spiral fibers; TS : tunnel spiral fibers; TR : tunnel radialfibers; B : basilar fibers; OS : outer spiral fibers.Efferent Innervation:Rasmussen: Olivocochlear bundle brings an efferent supply to thecochlea from the contra and homolateral superior olives. Reachesthe cochlea with the vestibular nerve through the anastomosis ofOort.- 18 -
(1) Efferent endings in the Organ of Corti are characterized by:(1) large size; (2) synaptic vesicles; (3) postsynaptic cisterna.(2) Efferents generally contact OHC directly but direct contactwith IHC is rare.Fig. 18.Schematic representation of efferent synaptic connections in theorgan of Corti of the cat. At the outer hair cells (OH) synapticcontacts are almost exclusively with the sensory cell and at theinner hair cells (IH) only with the afferent dendrites (AD). E :efferent ending.Degeneration StudiesFig. 19.Outline of experimental lesions, which have been carried out oncats. la-lc show the possible sites of interruption of the olivocochlearfibers; 2 the total transsection of the eighth nerve, and 3 aselective lesion of the cochlear nerve.- 19 -
Page 1 and 2: GENERAL COCHLEAR ANATOMYI. Scala Ve
Page 4 and 5: Fig. 15. Detailed Anatomy of the In
Page 8 and 9: By transsection of the entire olivo
Page 10 and 11: Fig. 20.Schema of the general inner
Page 12 and 13: COCHLEAR VASCULATUREExperiments sho
Page 14: Fig. 25.Guinea pig and man, spiral

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