. Cunningham's Text-book of anatomy. Anatomy. BASAL GANGLIA OF THE CEEEBKAL HEMISPHERE. 641 the lentiform nucleus into the caudate nucleus (fibrse lenticulocaudatse). From the globus pallidus fibres arise which proceed into the internal capsule in the region of the genu and the neighbouring part Internal capsule Nucleus caudatus The Red nuc Substanti nigra Rubrospinal tract. ,- Claustrum Insula __- Putamen Globus pallidus eduncularis Nucleus am\ Fig. 571.—Diagram of a Frontal Section to illustrate the Fibre Connexions of the Corpus Striatum. of the posterior limb (Fig. 572). Many of these fibr
. Cunningham's Text-book of anatomy. Anatomy. BASAL GANGLIA OF THE CEEEBKAL HEMISPHERE. 641 the lentiform nucleus into the caudate nucleus (fibrse lenticulocaudatse). From the globus pallidus fibres arise which proceed into the internal capsule in the region of the genu and the neighbouring part Internal capsule Nucleus caudatus The Red nuc Substanti nigra Rubrospinal tract. ,- Claustrum Insula __- Putamen Globus pallidus eduncularis Nucleus am\ Fig. 571.—Diagram of a Frontal Section to illustrate the Fibre Connexions of the Corpus Striatum. of the posterior limb (Fig. 572). Many of these fibres become collected on the inferior aspect of the lentiform nucleus, where they form a transversely directed bundle (Fig. 570), known as the ansa lenticularis, which is dis- tributed to the thalamus (Fig. 571, fasciculus striothalamicus) and hypothalamus, the red nucleus (fasciculus striorubricus) and substantia niger (fasciculus strionigricus). These connexions afford some explanation of the difficulties of articulation and swallowing and in the perform- ance of delicate voluntary move- ments that result from damage to the corpus striatum or to this system of fibres. This system of fibres is phylo- genetically very old, being the most primitive efferent tract from the cerebral hemisphere. Claustrum.—This is a thin plate of gray substance embedded in the white matter, which intervenes between the lentiform nucleus and the gray cortex of the insula. Followed in an upward direction, it becomes gradually thinner and ultimately disappears. As it is traced downwards, however, it thickens consider- ably, and at the base of the brain it comes to the surface at the anterior perforated substance and becomes continuous with the gray matter of the cortex. Its extent corresponds very closely with the area occupied by the insula, and its surface towards this portion of the cerebral cortex shows ridges and depressions corresponding to the insular gyri and sulci. Nucleus Amyg- dalae. —
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