Electrophysiological characterization of the superior paraolivary nucleus in the Mongolian gerbil.
نویسندگان
چکیده
The superior paraolivary nucleus (SPN) of the superior olivary complex (SOC) though morphologically well described, has not been characterized physiologically. Here we report the basic response properties of SPN units acquired with extracellular recording techniques under monaural acoustic stimulation in the Mongolian gerbil. Poststimulus-time histograms corresponded to those described earlier for the cat's cochlear nucleus (onset, chopper, primary-like), and partly to those previously acquired in other SOC nuclei (tonic, off/rebound). Two-thirds of the units responded solely to contralateral stimulation (40% excitatory [E], 19% inhibitory [I], 6% mixed [EI]). Most of the remainder responded equally to stimulation from either ear (18% I.I, 9% E.E). Overall, the monaural contralateral input was more effective than the ipsilateral and bilateral input. Characteristic frequencies and response areas covered the entire hearing range of the gerbil and the units mostly showed broad frequency-tuning. In combination, these properties suggest that the SPN might be a constituent of an afferent pathway encoding stimulus features across broad frequency ranges.
منابع مشابه
Topographic organization of serotonergic dorsal raphe neurons projecting to the superior colliculus in the Mongolian gerbil (Meriones unguiculatus).
Recent evidence suggests that the dorsal raphe nucleus (DRN) of the brainstem is a collection of neuronal clusters having different neurochemical characteristics and efferent projection patterns. To gain further insight into the neuroanatomic organization of the DRN, neuronal populations projecting to the superior colliculus (SC) were mapped in a highly visual rodent, the Mongolian gerbil (Meri...
متن کاملMetabolic Maturation of Auditory Neurones in the Superior Olivary Complex
Neuronal activity is energetically costly, but despite its importance, energy production and consumption have been studied in only a few neurone types. Neuroenergetics is of special importance in auditory brainstem nuclei, where neurones exhibit various biophysical adaptations for extraordinary temporal precision and show particularly high firing rates. We have studied the development of energy...
متن کاملPatterns of convergence in the central nucleus of the inferior colliculus of the Mongolian gerbil: organization of inputs from the superior olivary complex in the low frequency representation
Projections to the inferior colliculus (IC) from the lateral and medial superior olivary nuclei (LSO and MSO) were studied in the gerbil (Meriones unguiculatus) with neuroanatomical tract-tracing methods. The terminal fields of projecting axons were labeled via anterograde transport of biotinylated dextran amine (BDA) and were localized on series of horizontal sections through the IC. In additi...
متن کاملRecurrent Inhibition to the Medial Nucleus of the Trapezoid Body in the Mongolian Gerbil (Meriones Unguiculatus)
Principal neurons in the medial nucleus of the trapezoid body (MNTB) receive strong and temporally precise excitatory input from globular bushy cells in the cochlear nucleus through the calyx of Held. The extremely large synaptic currents produced by the calyx have sometimes led to the view of the MNTB as a simple relay synapse which converts incoming excitation to outgoing inhibition. However,...
متن کاملElectrophysiological, pharmacological and behavioral studies of different physiological roles of the nucleus paragigantocellularis
The nucleus paragigantocellularis (PGI) is located in the rostral ventrolateral medulla and has noticeable connections with some other brain nuclei, such as locus ceruleus, nucleus raphe magnus and periaqueductal gray. In rats it is 3 mm in rostrocaudal and 1 mm in mediolateral and 1 mm in the dorsolateral aspect. Anatomically and functionally, PGI has been divided into two subnuclei, retrofaci...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Hearing research
دوره 172 1-2 شماره
صفحات -
تاریخ انتشار 2002