Lentiform nucleus
| Brain: Lentiform nucleus | ||
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| Two views of a model of the striatum (on the right side of the brain): A, lateral aspect; B, medial aspect. | ||
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| Schematic representation of the chief ganglionic categories (I to V). | ||
| Latin | nucleus lentiformis | |
| Gray's | subject #189 834 | |
| NeuroNames | ancil-253 | |
| MeSH | Corpus+Striatum | |
The lentiform nucleus or lenticular nucleus comprises the putamen and the globus pallidus within the basal ganglia. It is a large, cone-shaped mass of gray matter just lateral to the internal capsule.
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[edit] Etymology
The name comes from Latin and means lens-shaped, probably referring to the appearance of the nucleus from the side.
[edit] Sections and size
When divided horizontally, it exhibits, to some extent, the appearance of a biconvex lens, while a coronal section of its central part presents a somewhat triangular outline.
It is shorter than the caudate nucleus and does not extend as far forward.
[edit] Boundaries
It is lateral to the caudate nucleus and thalamus, and is seen only in sections of the hemisphere.
It is bounded laterally by a lamina of white substance called the external capsule, and lateral to this is a thin layer of gray substance termed the claustrum.
Its anterior end is continuous with the lower part of the head of the caudate nucleus and with the anterior perforated substance.
[edit] Components
In a coronal section through the middle of the lentiform nucleus, two medullary laminæ are seen dividing it into three parts.
The lateral and largest part is of a reddish color, and is known as the putamen, while the medial and intermediate are of a yellowish tint, and together constitute the globus pallidus; all three are marked by fine radiating white fibers, which are most distinct in the putamen.
[edit] Additional images
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Dissection of brain-stem. Lateral view.
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Superficial dissection of brain-stem. Ventral view.
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Coronal section through mid-brain.
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Section of brain showing upper surface of temporal lobe.
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Coronal section of brain immediately in front of pons.
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Coronal section through anterior cornua of lateral ventricles.
[edit] See also
[edit] External links
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
