Propriospinal Inspiratory Neurons in the Upper Cervical Spinal Cord of the Rabbit: Location and Efferent Spinal Projections
A new group of inspiratory neurons was recently discovered in the upper cervical spinal cord of the cat (Aoki et al., 1980; Aoki, 1982). The group became a subject of several further studies as it could have represented an important relay and processing site interposed between the respiratory neurons of the brain stem and spinal respiratory motoneurons. It has been established that the cervical neurons form a well defined longitudinal column which extends from C1 to C3 cervical segments and send descending projections which may reach lower thoracic segments (Aoki et al., 1984; Lipski and Duffin, 1986). Although a monosynaptic connections of these neurons with either phrenic or external intercostal motoneurons were rather uncommon (Lipski and Duff in, 1986), the neurons still seemed potentially capable of providing indirectly a substantial drive to spinal respiratory motoneurons.
KeywordsCervical Spinal Cord Respiratory Neuron Sympathetic Preganglionic Neuron Inspiratory Neuron Phrenic Nerve Activity
Unable to display preview. Download preview PDF.
- Aoki, M., 1982, Respiratory related neuron activities in the cervical cord of the cat, in: “Proceedings of the International Symposium. Central Neural Production of Periodic Respiratory Movements”, J.L. Feldman and A.J. Berger, eds., Lake Bluff, Illinois.Google Scholar
- Aoki, M., Kasaba, T., Kurosawa, Y., Ohtsuka, K., and Satomi, H., 1984, The projection of cervical respiratory neurons to the phrenic nucleus in the cat, Neurosci. Lett., Suppl. 13: S9.Google Scholar
- Budzifiska, K., and Romaniuk, J.R., 1986, Phrenic reflexes in the decerebrate and spinal rabbit, Bull. Eur. Physiopathol. Respir., 22: 65Google Scholar
- Gromysz, H., and Karczewski, W.A., 1981, Respiratory activity generated by a split brainstem preparation of the rabbit, Acta Neurobiol. Exp., 41: 237.Google Scholar
- 1987.Kirkwood, P.A., Munson, J.B., Westgaard, R.H., and Sears, T.A., The organization of the respiratory input to intercostal motoneurones: the contribution from interneurones? in: “Respiratory Muscles and Their Neuromotor Control”, G.Sieck, ed., A.R. Liss Inc., New York.Google Scholar