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The effects of wing bud extirpation on the brachial sympathetic ganglia of the chick embryo

, : The effects of wing bud extirpation on the brachial sympathetic ganglia of the chick embryo. Journal of Experimental Zoology 110(2): 247-257

Planimetric area measurements of camera lucida drawings of the paired brachial sympathetic (paravertebral) ganglia were made on 6 embryos in which the right wing buds had been extirpated at 3 days of incubation. 4 specimens were fixed at 8 days of incubation, and 2 at 10 days. The sympathetic ganglia of the younger embryos showed no effect of the operation. In the 2 18-day embryos, each of the brachial sympathetic ganglia showed a gray matter hypoplasia on the operated side, varying from 19.7% to 81.3%. The over-all hypoplasia of gray matter area was 31% in one case and 70.4% in the other case. It is concluded that the initial phase of differentiation of the brachial paraverte-bral sympathetic ganglia are independent of the peripheral field. However, in a later phase of differentiation these ganglia respond to a reduction of their peripheral field as do the somatic centers. Since at the 8-day stage, the somatic sensory ganglia and the somatic motor columns show a severe hypoplasia following wing bud extirpation, it is concluded that no correlation exists between the development of the somatic centers and the early development of the sympathetic ganglia.


PMID: 18119182

DOI: 10.1002/jez.1401100205

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