Sections of thalamus and metathalamus Sectiones thalamici et metathalamici See p 409

12 Reticular nucleus of thalamus. Nucleus reticu-latus [thalami].Thin layer lying mainly laterally along the thalamus between the posterior limb of the internal capsule and external medullary lamina of the thalamus. It receives tributaries from the entire cerebral cortex, globus pallidus and reticular formation of the brainstem and gives off efferent fibers to the reticular formation of the midbrain and thalamus. B

13 Anterior nuclei of thalamus. Nuclei anteriores [thalami]. Cell group in the apex of the thalamus. They receive fibers from the mamil-lothalamic tract and have projections to the cingulate gyrus.

14 Anterodorsal nucleus. Nucleus anterodorsalis (anterosuperior). Narrow cell plate anterosupe-riorly. B

15 Anteroventral nucleus. Nucleus anter-oventralis (anteroinferior). Main nucleus of the anterior nuclei. B

16 Anteromedial nucleus. Nucleus anteromedian. Degenerating nuclear remains situated medial and inferior to the anteroventral nucleus. B

17 Median nuclei of thalamus. Nuclei mediani [thalami]. Collective term for the nuclei located medial and for the most part directly inferior to the ependyma.

18 Anterior/posterior paraventricular nuclei. Nuclei paraventriculares anteriores/posteriores. Cell groups in the wall of the third ventricle with neuronal function (among others, vasopressin, angiotensin II, renin). C D E

19 Rhomboidal nucleus. Nucleus rhomboidalis. It often forms the interthalamic adhesion. D

20 Nucleus reuniens. Nucleus extending from the anterior end of the anterior tubercle to the middle of the interthalamic adhesion. It may be concerned with the formation of the latter when present. It is absent in 28% of males and 14% of females. D

20 a Paratenial nucleus of thalamus. Nucleus parataenialis [thalami]. Located between the stria medullaris, tenia, anterodorsal and para-ventricular nuclei of the thalamus; it is probably involved in the processing of olfactory stimuli.

21 Medial nuclei of thalamus. Nuclei mediales [thalami]. Mass of nuclei medial to the internal medullary lamina with projections to other thalamic nuclei and to the frontal lobe.

22 Dorsal medial nucleus. Nucleus medialis dorsalis. Principal nucleus of this group. C D

23 Internal/external medullary lamina. Lamina medullaris interna/externa. Layer of white matter which, provided it is located internally, has Y-shaped sections and divides the thalamus into anterior, medial and lateral regions. B

24 Reticular (intralaminar) nuclei of thalamus. Nuclei reticulares (intralaminares thalami). Nuclei located in the medullary lamina. They correspond functionally to the reticular formation and thus are integrating nuclei.

25 Centromedian nucleus. Nucleus centromedianus. It is the largest nucleus of this group and has projections to the corpus striatum, hypothalamus, and other structures. E

26 Paracentral nucleus. Nucleus paracentralis. It lies in the internal medullary lamina lateral to the centromedian nucleus. CD

27 Parafascicular nucleus. Nucleus parafascicu-laris. It lies medial to the occipital region of the centromedian nucleus. E

28 Lateral central nucleus. Nucleus centralis lateralis. It lies dorsolateral and medial to the centromedian nucleus. E

29 Medial central nucleus. Nucleus centralis medialis. It lies at the lower medial end of the internal medullary lamina.

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