RT Journal Article
SR Electronic
T1 Primordial Rhythmic Bursting in Embryonic Cochlear Ganglion Cells
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 8129
OP 8135
DO 10.1523/JNEUROSCI.21-20-08129.2001
VO 21
IS 20
A1 Timothy A. Jones
A1 Sherri M. Jones
A1 Kristina C. Paggett
YR 2001
UL http://www.jneurosci.org/content/21/20/8129.abstract
AB This study examined the nature of spontaneous discharge patterns in cochlear ganglion cells in embryonic day 13 (E13) to early E17 chicken embryos (stages 39–43). Neural recordings were made with glass micropipettes. No sound-driven activity was seen for the youngest embryos (maximum intensity 107 dB sound pressure level). Ganglion cells were labeled with biotinylated dextran amine in four embryos. In two animals, primary afferents projected to hair cells in the middle region along the length of the basilar papilla in which, in one cell, the terminals occupied a neural transverse position and, in the other, a more abneural location. Statoacoustic ganglion cells showing no spontaneous activity were seen for the first time in the chicken. The proportion of “silent” cells was largest at the youngest stages (stage 39, 67%). In active cells, mean spontaneous discharge rates [9.4 ± 10.4 spikes (Sp)/sec; n = 44] were lower than rates for older embryos (19 ± 17 Sp/sec) (Jones and Jones, 2000). Embryos at stages 39–41 evidenced even lower rates (4.2 ± 5.0 Sp/sec). The most salient feature of spontaneous activity for stages 39–43 was a bursting discharge pattern in >75% of active neurons (33 of 44). Moreover, in 55% of these cells, there was a clear, slow, rhythmic bursting pattern. The proportion of cells showing rhythmic bursting was greatest at the youngest stages (39–42) and decreased to <30% at stage 43. Rate of bursting ranged from 1 to 54 bursts per minute. The presence of rhythmic bursting in cochlear ganglion cells at E13–E17 provides an explanation for the existence of such patterns in central auditory relays. The bursting patterns may serve as a patterning signal for central synaptic refinements in the auditory system during development.