THE MORPHOLOGY AND POSTNATAL DEVELOPMENT OF THE SYNAPSES IN THE NUCLEUS OF THE TRAPEZOID BODY
- VernacularTitle:斜方体核内突触的形态及其生后的发育
- Author:
Renyi HU
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1957;0(04):-
- CountryChina
- Language:Chinese
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Abstract:
The present work has been studied the morphology and postnatal development of the synapses in the nucleus of the trapezoid body of mice and rats with the silver impregnation method of Golgi-Deineka for paraffin sections. Adult rats and mice and rats of 1, 7, 16, 18 and 30 days old were selected for study.The morphology of the synapses in the nucleus of the trapezoid body was described. The form and structure of the synapses in this nucleus are different from those in the other regions of the brain in that the soma of its neuron is surrounded by coarse fibers. According to the form and configuration of the synapses, besides a few boutons terminaux, the endings of the coarse fibers in the nucleus of the trapezoid body were divided into four types: network-like, loop-like, calyx-like and claw-like. The calyx-like and claw-like endings never have been found in the other parts of the central nervous system. The present results show that the calyces are present in the nucleus of the trapezoid body at either 12.14% (mouse) or 11.01% (rat) of the total number of synapses.Usually, a Held calyx is only in contact with one neuron around the cell body in the nucleus of the trapezoid body. The calyces have not fully differentiated at the early stage of the postnatal period. During 16～30 days of the postnatal development the calyces gradually developed. The postnatal develoment of the synapses in the nucleus of the trapezoid body, especially the morphological differentiation of Held calyces is closely related to the development of the auditory reflex.
