B21

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B21 is a sensory neuron in the buccal ganglion of Aplysia californica.

A schematic of B21. from the Cropper lab
B21 excites B8 motor neuron in the lateral branch. Central depolarization of B21 determines whether the peripherally generated spikes will propagate to the lateral branch, allowing B21 to excite B8.

B4/5 inhibits B21, preventing B21 from exciting B8. The magnitude of the inhibition is spike frequency-dependent.


References

  1. Evans CG, Ludwar BCh, Cropper EC. Mechanoafferent neuron with an inexcitable somatic region: consequences for the regulation of spike propagation and afferent transmission. J Neurophysiol. 2007 Apr;97(4):3126-30. Epub 2007 Jan 31. PMID: 17267750
  2. Evans CG, Romero A, Cropper EC. Inhibition of afferent transmission in the feeding circuitry of aplysia: persistence can be as important as size. J Neurophysiol. 2005 May;93(5):2940-9. Epub 2004 Dec 29. PMID: 15625089
  3. Shetreat-Klein AN, Cropper EC. Afferent-induced changes in rhythmic motor programs in the feeding circuitry of aplysia. J Neurophysiol. 2004 Oct;92(4):2312-22. Epub 2004 Jun 2. PMID: 15175374
  4. Evans CG, Jing J, Proekt A, Rosen SC, Cropper EC. Frequency-dependent regulation of afferent transmission in the feeding circuitry of Aplysia. J Neurophysiol. 2003 Dec;90(6):3967-77. Epub 2003 Sep 24. PMID: 14507990
  5. Evans CG, Jing J, Rosen SC, Cropper EC. Regulation of spike initiation and propagation in an Aplysia sensory neuron: gating-in via central depolarization. J Neurosci. 2003 Apr 1;23(7):2920-31. PMID: 12684479
  6. Klein AN, Weiss KR, Cropper EC. Glutamate is the fast excitatory neurotransmitter of small cardioactive peptide-containing Aplysia radula mechanoafferent neuron B21. Neurosci Lett. 2000 Jul 28;289(1):37-40. PMID: 10899403
  7. Rosen SC, Miller MW, Cropper EC, Kupfermann I. Outputs of radula mechanoafferent neurons in Aplysia are modulated by motor neurons, interneurons, and sensory neurons. J Neurophysiol. 2000 Mar;83(3):1621-36. PMID: 10712484
  8. Rosen SC, Miller MW, Evans CG, Cropper EC, Kupfermann I. Diverse synaptic connections between peptidergic radula mechanoafferent neurons and neurons in the feeding system of Aplysia. J Neurophysiol. 2000 Mar;83(3):1605-20. PMID: 10712483
  9. Borovikov D, Evans CG, Jing J, Rosen SC, Cropper EC. A proprioceptive role for an exteroceptive mechanoafferent neuron in Aplysia. J Neurosci. 2000 Mar 1;20(5):1990-2002.PMID: 10684900
  10. Alexeeva V, Borovikov D, Miller MW, Rosen SC, Cropper EC. Effect of a serotonergic extrinsic modulatory neuron (MCC) on radula mechanoafferent function in Aplysia. J Neurophysiol. 1998 Oct;80(4):1609-22. PMID: 9772225
  11. Cropper EC, Evans CG, Rosen SC. Multiple mechanisms for peripheral activation of the peptide-containing radula mechanoafferent neurons B21 and B22 of Aplysia. J Neurophysiol. 1996 Aug;76(2):1344-51. PMID: 8871241
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