Ascending and descending projections from the superior olivary complex in guinea pigs: Different cells project to the cochlear nucleus and the inferior colliculus

2002 ◽  
Vol 453 (3) ◽  
pp. 217-225 ◽  
Author(s):  
Brett R. Schofield
Keyword(s):  
Inferior Colliculus ◽  
Cochlear Nucleus ◽  
Guinea Pigs ◽  
Superior Olivary Complex ◽  
Descending Projections

Descending projections from the superior olivary complex to the cochlear nucleus of the cat

1987 ◽  
Vol 259 (3) ◽  
pp. 452-465 ◽  
Author(s):  
Kevin M. Spangler ◽  
Nell B. Cant ◽  
Craig K. Henkel ◽  
Glenn R. Farley ◽  
W. Bruce Warr
Keyword(s):  
Cochlear Nucleus ◽  
Superior Olivary Complex ◽  
Descending Projections

Serotonin and Serotonin Receptors in the Central Auditory System

1994 ◽  
Vol 110 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Glenn C. Thompson ◽  
Ann M. Thompson ◽  
Kennon M. Garrett ◽  
B. Hill Britton
Keyword(s):  
Ligand Binding ◽  
Inferior Colliculus ◽  
Auditory System ◽  
Auditory Processing ◽  
Cochlear Nucleus ◽  
Serotonin Receptors ◽  
Superior Olivary Complex ◽  
Receptor Subtype ◽  
Central Auditory Processing ◽  
Serotonergic Cell

Immunohistochemical and ligand-binding techniques were used to visualize the neurotransmitter serotonin and one of its receptors, the 5-HT1A subtype, in auditory nuclei of the brainstem. Serotonergic fibers and terminal endings were found in all auditory nuclei extending from the cochlear nucleus to the inferior colliculus, including the superior olivary complex and the nuclei of the lateral lemniscus. The density of the innervation varied between and within each nucleus. All serotonergic cell bodies were located outside the auditory nuclei. The 5-HT1A receptor subtype was found in the cochlear nucleus as well as in the inferior colliculus. With no serotonergic cell bodies present in the auditory nuclei, the present neuroanatomic and neurochemical findings support behavioral and neurophysiologic findings that the serotonergic system may modulate central auditory processing.

Responses of single units in cerebellar vermis of the cat to monaural and binaural stimuli

1975 ◽  
Vol 38 (2) ◽  
pp. 418-429 ◽  
Author(s):  
L. M. Aitkin ◽  
J. Boyd
Keyword(s):  
Inferior Colliculus ◽  
Cochlear Nucleus ◽  
Single Units ◽  
Intensity Difference ◽  
Cerebellar Neurons ◽  
Monaural Stimulation ◽  
Sustained Responses ◽  
Maximal Discharge ◽  
Onset Responses ◽  
Stimulation Of

The responses of 146 cerebellar neurons to tone stimuli were studied in 29 cats anesthetized with chloralose-urethan and in 7 decerebrate preparations. Units were classified as onset or sustained firing. Onset spikes occurred on stimulation of either ear and showed binaural facilitation, while sustained discharges were frequently only excited by monaural stimulation. The latent periods of sustained discharges appeared to be shorter than those of onset responses, and sustained discharges were also more sharply tuned than the onset units. Evidence was presented suggesting that onset responses reflected input from the inferior colliculus and sustained responses, the cochlear nucleus. The sterotyped facilitatory behavior of onset units suggested that a maximal discharge might occur if sounds were of equal intensity at each ear; 26 neurons were examined with variable interaural time or intensity differences and 10 of these exhibited maximal firing when the interaural time and intensity difference was zero--i.e., if the sound was located directly in front of the head.

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