Sections through telencephalon Sectiones telencephali

2 Cerebral cortex. Cortex cerebralis (pallium). Gray matter, 1.5-4.5 mm thick, consisting mainly of the following six layers. A

3 Molecular (plexiform) layer. 1st layer. Lamina molecularis (plexiformis). It contains a few tangential cells and a thick network of tangential fibers from dendrites of pyramidal cells and axons of other cells. None of its projections extend beyond the cerebral cortex. A

4 External granular layer. 2nd layer. Lamina granularis externa. A layer of small cells in a fine fiber network. A

5 External pyramidal layer (pyramidal cell layer). 3rd layer. Lamina pyramidalis externa. It contains medium-sized pyramidal cells which do not form long tracts. A

6 Internal granular layer. 4th layer. Lamina granu-laris interna. It consists predominantly of closely packed stellate cells and receives impulses primarily from thalamocortical fibers. Its stria is comprised of densely stratified tangential fibers. A

7 Internal pyramidal (ganglionic) layer. 5th layer. Lamina pyramidalis interna (ganglionaris). It contains larger pyramidal cells and is the exit of the corticonuclear and corticospinal tracts in the corresponding regions of areas 4 and 6. A

8 Multiform (fusiform) layer. 6th layer. Lamina multiformis. Poorly defined layer made up of many, mostly small, fusiform cells extending into the white matter. A

9 Tangential fibers. Neurofibrae tangentiales. Superficial fiber complex comprised of the following four layers.

10 Stria of molecular layer. Stria laminae molecularis (plexiformis). Band of tangential fibers in the 1st layer ofthe cerebral cortex. A

11 Stria of external granular layer. Stria laminae granularis externa. Thinner band of tangential fibers in the 2nd layer ofthe cerebral cortex. A

12 Stria of internal granular layer. Stria laminae granularis interna. Band of tangential fibers in the 4th layer of the cerebral cortex [[outer stripe of Baillarger]]. A

13 Stria of internal pyramidal layer. Stria laminae pyramidalis interna (ganglionaris). Band of tangential fibers in the 5th layer of the cerebral cortex [[inner stripe of Baillarger]]. A

14 Arcuate fibers of cerebrum. Fibrae arcuatae cerebri. Arcuate fibers connecting the adjacent cerebral gyri. F

15 Cingulum. Fiber bundle lying in the medulla of the cingulate gyrus. It arises from the area sub-callosa, arches around the corpus callosum, passes the splenium and extends anteriorly up to the uncus. C

16 Superior longitudinal fasciculus. Fasciculus longitudinalis superior. Largest bundle of association fibers in the cerebrum, extending from the frontal lobe to the temporal lobe via the occipital lobe. E

17 Inferior longitudinal fasciculus. Fasciculus longitudinalis inferior. Bundle of association fibers connecting the temporal and occipital lobes. E

18 Uncinate fasciculus. Fasciculus uncinatus. Association fibers connecting the inferior surface of the frontal lobe and the anterior part of the temporal lobe. E

19 Radiation of corpus callosum. Radiatio corporis callosi. Fibers connecting the right and left cerebral cortices. See also p. 312.11-14. C

20 Basal nuclei. Nuclei basales. Basal ganglion.

21 Corpus striatum. The striate body, which is comprised ofbasal ganglia (caudate nucleus and putamen) united by bundles of gray matter. Central synaptic station of the extrapyramidal system. D

22 Caudate nucleus. Nucleus caudatus. Elongated, arched nucleus that arises from the ganglionic mass of the telencephalon and curves around the thalamus.

23 Head of caudate nucleus. Caput [[nuclei cau-dati]]. Anteriorly situated structure that forms the lateral wall of the anterior horn of the lateral ventricle. B D

24 Body of caudate nucleus. Corpus [[nuclei cau-dati]]. Middle part of caudate nucleus lying on the thalamus. B D

25 Tail of caudate nucleus. Cauda [[nuclei cau-dati]]. It accompanies the inferior horn and forms the tapering posterior and inferior segments of the caudate nucleus. D

26 Lentiform nucleus. Nucleus lentiformis (lenticularis). Part of the corpus striatum that arises from the telencephalon and diencephalon. D

27 Putamen. Lateral, telencephalic portion of the lentiform nucleus. B

28 Lateral medullary lamina. Lamina medullaris lateralis. Medullary layer of the corpus striatum situated between the globus pallidus and putamen. B

29 Lateral globus pallidus. Globus pallidus later-alis. Part ofthe diencephalic globus pallidus located between the lateral and medial medullary laminae. B

30 Medial medullary lamina. Lamina medullaris medialis. Medullary layer between the medial and lateral parts of the globus pallidus. B

31 Medial globus pallidus. Globus pallidus medialis. Part of the globus pallidus located medial to the medial medullary lamina. B

32 Claustrum. Layer of gray matter between the lentiform nucleus and the insular cortex. B

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