Pritz M B
Section of Neurological Surgery, Indiana University School of Medicine, Indianapolis 46202-5124, USA.
Brain Behav Evol. 1995;46(4-5):197-208. doi: 10.1159/000113274.
Certain aspects of thalamic organization in reptiles and mammals are reviewed. Features shared by the dorsal thalamus of reptiles and that of mammals include projection to the telencephalon, specific and non-specific non-telencephalic afferents, and input from the thalamic reticular nucleus. Differences between the dorsal thalamus of reptiles and that of mammals are the absence of reciprocal telencephalic efferents to the dorsal thalamus and lack of local circuit neurons in reptiles (with the exception of the dorsal geniculate complex in turtles) and their presence in mammals. A thalamic reticular nucleus is present in both reptiles and mammals. In both of these classes of vertebrates, this neuronal aggregate surrounds the dorsal thalamus along its lateral surface, projects to the dorsal thalamus, and is organized into sectors. In one group of reptiles, Caiman crocodilus, the sole reptilian group in which immunocytochemical features have been investigated in detail, the reticular nucleus contains at least three neuronal subpopulations: neurons immunoreactive for glutamic acid decarboxylase (GAD); neurons immunoreactive for parvalbumin; and cells that are not immunoreactive for parvalbumin or, probably, GAD. On the other hand, the reticular nucleus of mammals contains a single population of neurons immunoreactive for GAD, gamma amino butyric acid, and parvalbumin.
本文综述了爬行动物和哺乳动物丘脑组织的某些方面。爬行动物和哺乳动物背侧丘脑的共同特征包括向端脑的投射、特定和非特定的非端脑传入以及来自丘脑网状核的输入。爬行动物和哺乳动物背侧丘脑的差异在于，爬行动物背侧丘脑缺乏来自端脑的相互传出纤维，且缺乏局部回路神经元（海龟的背侧膝状复合体除外），而哺乳动物则有。爬行动物和哺乳动物都有丘脑网状核。在这两类脊椎动物中，这个神经元集合体沿着背侧丘脑的外侧表面围绕着它，投射到背侧丘脑，并被组织成不同的区域。在一组爬行动物凯门鳄中，这是唯一一组对免疫细胞化学特征进行了详细研究的爬行动物，网状核至少包含三个神经元亚群：对谷氨酸脱羧酶（GAD）免疫反应的神经元；对小白蛋白免疫反应的神经元；以及对小白蛋白或可能对GAD无免疫反应的细胞。另一方面，哺乳动物的网状核包含单一的对GAD、γ-氨基丁酸和小白蛋白免疫反应的神经元群体。
