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Amygdaloid body (amygdala). Corpus amyg-daloideum.Ovoidgroupofnucleiinfrontofthein-ferior horn of the lateral ventricle that communicates with the medial cerebral cortex. It forms part of the rhinencephalon, has some autonomic functions, and influences emotional behavior. D Anterior amygdaloid area. Area amygdaloidea anterior. Anterior group of cells directed toward the anterior perforated substance. It receives fibers from the lateral olfactory tract. The diagonal band of Broca arises from this area. D Basolateral part. Pars basolateralis. In humans, it contains the largest group of nuclei of the amygdala complex. It receives no olfactory fibers but has projections to the hypothalamus, hippocampus and other parts of the brain, as well as with the stria terminalis. D Corticomedial part. Pars corticomedialis [olfac-toria]. Smaller superomedially directed group of nuclei that receives fibers from the olfactory tract and is involved in the formation of the stria terminalis. D

Extreme capsule. Capsula extrema. White matter between the cortex of the insula and the claustrum. A B

External capsule. Capsula externa. White matter between the claustrum and lentiform nucleus. AB Internal capsule. Capsula interna. Very important conduction band lying medial to the lentiform nucleus and lateral to the thalamus and caudate nucleus. A

Anterior limb of internal capsule. Crus anterius capsulae internae. Structure lying between the lentiform nucleus and the head of the caudate nucleus. A

Anterior thalamic radiations. Radiationes thalamicae anteriores. It contains fibers that connect the frontal lobe and the medial nucleus of the thalamus, as well as the anterior nucleus of the thalamus and the anterior region of the cingulate gyrus. B

Frontopontine tract. Tractus frontopontinus. Fibers extending from the frontal lobe to the nuclei of the pons. B

Genu of internal capsule. Genu capsulae internae. It lies between the anterior and posterior limbs of the internal capsule and forms part of the lateral wall of the ventricular system. A B Corticonuclear tract. Tractus corticonuclearis. Part of the pyramidal tract passing into the motor nuclei of the cranial nerves. B Posterior limb of internal capsule. Crus posterius capsulae internae. The part of the internal capsule that separates the lentiform nucleus from the thalamus and body of caudate nucleus. A Thalamolentiform part. Pars thalamolenti-formis.Portionoftheposteriorlimboftheinternal capsule that extends up to the posterior margin of the lentiform nucleus. B

Corticospinal fibers. Fibrae corticospinales. Part of the pyramidal tract that is organized somatotopi-cally in such a way that the fibers for the most caudal region of the body lie farthest toward the occiput. B

16 Corticorubral fibers. Fibrae corticorubrales. Fibers extending from the frontal lobe to the red nucleus. B

17 Corticoreticular fibers. Fibrae corticoreticulares. Fibers passing from the region in front of and behind the central sulcus to the reticular formation. B

18 Corticothalamic fibers. Fibrae corticothalamicae. Part of the thalamic radiation in the thalamus. B

19 Thalamoparietal fibers. Fibrae thalamoparietales. Nerve fibers that project from the cerebral cortex to the thalamus. B

20 Central thalamic radiations. Radiationes thalam-icae centrales. Nerve fibers that radiate from the superior portion of the cerebral cortex to the thalamus. B See also p. 302.2.

21 Sublentiform part. Pars sublentiformis. Portion of internal capsule lying below the posterior part of the lentiform nucleus. A B

22 Optic radiation [[Gratioleti]]. Radiatio optica. Fiber tract thatradiates from the lateral geniculate body to the area striata in the occipital lobe. AB

23 Acousticradiation.Radiatioacustica.Auditorytract that radiates from the medial geniculate body to the transverse temporal gyrus [[Heschl]]. AB

24 Corticotectal fibers. Fibrae corticotectales. Connecting fibers between the cerebral cortex and the tectum. B

25 Temporopontine fibers. Fibrae temporopontinae. Fibers of the cerebropontocerebellar tract that arise from the temporal lobe. B

26 Retrolentiform part. Pars retrolentiformis. Portion of internal capsule situated occipital to the lentiform nucleus. AB

27 Posterior thalamic radiations. Radiationes thalam-icae posteriores. B

28 Parieto-occipitopontine fasciculus. Fasciculus parieto-occipitopontinus. Portion of cerebropon-tocerebellar tract arising from the parietal and occipital lobes. B

29 Corona radiata. Fibers of the internal capsule radiating fanlike in all directions toward the cerebral cortex. A

30 Anterior commissure. Commisura anterior. It lies in front of the column of the fornix and is readily visible in the anterior wall of the third ventricle. A

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