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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 50 (1983), S. 359-366 
    ISSN: 1432-1106
    Keywords: Ambiguous motoneurons ; Ultrasonic vocalization ; Unitary discharges ; Respiration ; Ventral division
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Unit discharges associated with ultrasonic vocalization were recorded from the rat medullary region including the nucleus ambiguous (NA). Three types of units were distinguished: ultrasound-related (US), expiration (EXP) and inspiration (INSP) units. Both US and EXP units discharged with tonic bursts mostly prior to ultrasounds. US units were silent during respiration while EXP units discharged synchronously with expiration. During ultrasonic vocalization INSP units suppressed their discharges which were otherwise synchronized with inspiration. Histological examination revealed that US and EXP units were recorded from the ventral division of the NA and the adjacent medullary region where the NA contained large cells and the adjacent region consisted of small cells. These results suggest that both US and EXP units are NA motoneurons responsible for ultrasound emission. EXP units were always supplied with respiratory afferents while US units were not.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 75 (1989), S. 381-389 
    ISSN: 1432-1106
    Keywords: Dorsal cochlear nucleus ; Tonotopical organization ; Unitary discharges ; Sidebands ; Pure tone burst ; Rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Pure tone burst stimulation was used to study discharge properties and tonotopic organization in the dorsal cochlear nucleus (DCN) of rats anesthetized with alpha-chloralose urethane. An animal's head was fixed with a fine nail embedded in the skull in order to prevent the head from moving. Unit discharges of DCN neurons were recorded with micropipettes filled with fast green dye. Free field pure tone bursts were presented using a ribbon tweeter; it delivered stimuli at a maximum SPL of 96 dB. Electrode tracks were reconstructed through subsequent histological examinations. A total of 429 units were sampled in 51 animals. Of these, 230 units (54%) responded to tone bursts higher than 20 kHz with a mean latency of 6.3 ms. Tonotopical organization was clearly evident throughout the mediolateral axis of the DCN; high frequencies were represented medially and low frequencies laterally. Nearly constant frequencies were represented along the dorsoventral axis and no systematic organization was observed along the rostrocaudal extension of the DCN. When tuning curves were measured in DCN neurons with excitatory and inhibitory responses, we found that inhibitory sidebands were usually located in a frequency range higher or lower than the excitatory response area and sometimes partially overlapped with it.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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