Part of this work was done in the Department of Anatomy, Harvard Medical School, Boston 15, Massachusetts. The work done at the Harvard Medical School was supported in part by grant GM-11182–10 from the National Institutes of Health, United States Public Health Service.
The fine structure of nerve endings in the nucleus of the trapezoid body and the ventral cochlear nucleus
Article first published online: 3 FEB 2005
Copyright © 1966 Wiley-Liss, Inc.
American Journal of Anatomy
Volume 118, Issue 2, pages 375–389, March 1966
How to Cite
Lenn, N. J. and Reese, T. S. (1966), The fine structure of nerve endings in the nucleus of the trapezoid body and the ventral cochlear nucleus. Am. J. Anat., 118: 375–389. doi: 10.1002/aja.1001180205
- Issue published online: 3 FEB 2005
- Article first published online: 3 FEB 2005
Large, calyciform axonal endings, as well as typical terminal boutons, have been previously described in the ventral cochlear nucleus and the nucleus of the trapezoid body by light microscopists. In the present study, these endings were examined with the electron microscope in chinchillas, rats, and a cat after perfusion fixation with osmium tetroxide. The calyces were found to consist of elongated processes arising from myelinated axons and making multiple synaptic contacts with perikarya and dendrites. This finding suggests that an important property of calyces is the large amount of synaptic activity that they can bring to bear on a single post-synaptic structure. Adjacent to the calyciform endings were variable numbers of boutons that made synaptic contacts with the same perikarya and dendrites. The majority of boutons contained smaller synaptic vesicles than those present in the calyces, implying both anatomical and functional differences between these two types of ending. It is suggested that many of these boutons in the ventral cochlear nucleus are endings of centrifugal, inhibitory fibers described by previous workers.