メジロの視床下部-脳下垂体神経分泌系とコリンエステレース
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概要
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The distribution of cholinesterases (ChE) in the hypothalamo-hypophysial neurosecretory system of the bird, Zosterops palpebrosa japonica has been examined histochemically (Fig. 13). A high acetylcholinesterase (AChE) activity occurs in the perikarya of the neurosecretory cells of the nucleus supraopticus (Fig. 1), the nucleus paraventricularis (Fig. 8), the entopeduncular cell group and the nucleus lateralis externus hypothalami (see Uemura and Kobayashi, 1962; Fig. 3). The perikarya of the non-neurosecretory cells of the nucleus tuberis, the nucleus hypothalamicus lateralis and the nucleus hypothalamicus inferior also have a high AChE activity (Fig. 11). The proximal parts of the axons of the neurosecretory cells and of the axons of the three non-neurosecretory nuclei also show a strong AChE activity (Figs. 3 and 8). The external layer of the anterior and posterior divisions of the median eminence shows a moderate AChE activity (Figs. 6, 9 and 11). The distribution of the enzyme in the anterior division of the median eminence is very similar to that in the neurosecretory axons as revealed by Gomori's aldehyde-fuchsin method (see Uemura and Kobayashi, 1962). This suggests that neurosecretory axon endings contain a moderate amount of AChE. In the pars nervosa, there is weak AChE activity (Fig. 5). The physiological significance of the presence of AChE in the neurosecretory system, the nucleus tuberis, the nucleus hypothalamicus lateralis and the nucleus hypothalamicus inferior is discussed in relation to neurosecretory activities and in relation to the function of the median eminence. Most cells of the cephalic lobe of the pars distalis and some cells of a certain type(s) of the caudal lobe have a non-specific ChE activity. A strong non-specific ChE activity also occurs in the cells of the pars tuberalis (Figs. 6, 7, 9 and 12). This investigation was supported by grants from the Ministry of Education of Japan and from the National Institute of Health (A-3678), U.S.A., to Dr. H. Kobayashi.
- 1964-04-15