Orpen B G, Steiner M
St. Joseph's Hospital Research Institute, Hamilton, Ontario, Canada.
J Anat. 1994 Feb;184 ( Pt 1)(Pt 1):23-33.
The neural connections of brain areas involved in the control of circadian rhythms were investigated in the Syrian hamster by observing the anterograde and retrograde neural labelling resulting from injections of HRP-WGA into the suprachiasmatic nucleus (SCN) and subparaventricular zone (SPZ). The neural connections of these 2 brain areas in the strongly photoperiodic hamster are very similar to those in the more weakly photoperiodic rat. Two differences were observed: (1) in the rat, but not in the hamster, the SCN projects to the ventral geniculate nucleus and intergeniculate leaflet of the thalamus; and (2) reciprocal contralateral neural connections appear to be more numerous in the hamster than in the rat SCN. These differences may relate to the differences in photoperiodic sensitivity of the 2 species.
通过观察将HRP-WGA注射到叙利亚仓鼠的视交叉上核（SCN）和室旁下区（SPZ）后产生的顺行和逆行神经标记，研究了参与昼夜节律控制的脑区的神经连接。在强光周期的仓鼠中，这两个脑区的神经连接与光周期较弱的大鼠非常相似。观察到两个差异：（1）在大鼠中，SCN投射到丘脑的腹侧膝状核和间膝小叶，而在仓鼠中则没有；（2）仓鼠中相互的对侧神经连接似乎比大鼠SCN中的更多。这些差异可能与这两个物种在光周期敏感性上的差异有关。
