Lentiform nucleus

Lentiform nucleus
Lentiform nucleus
	Lentiform nucleus (in red) shown within the brain
	Two views of a model of the striatum (on the right side of the brain): A, lateral aspect; B, medial aspect.
Details
Identifiers
Latin	nucleus lentiformis
NeuroNames	1234
TA98	A14.1.09.506
TA2	5567
FMA	77615
	Anatomical terms of neuroanatomy [edit on Wikidata]

The lentiform nucleus, or lenticular nucleus, comprises the putamen and the globus pallidus within the basal ganglia. With the caudate nucleus, it forms the dorsal striatum. It is a large, lens-shaped mass of gray matter just lateral to the internal capsule.

Increased volume of the lentiform nuclei has been observed in obsessive–compulsive disorder, with decreased volume conversely observed in other anxiety disorders.

Structure[]

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.

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.

Components[]

In a coronal section through the middle of the lentiform nucleus, two medullary laminae 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.

Etymology[]

The name comes from Latin and means lens-shaped, probably referring to the appearance of the nucleus from the side.

Additional images[]

Schematic representation of the chief ganglionic categories (I to V)
Dissection of brain-stem. Lateral view.
Superficial dissection of brain-stem. Ventral view.
Transverse section through mid-brain
Section of brain showing upper surface of temporal lobe
Coronal section of brain immediately in front of pons
Coronal section through anterior cornua of lateral ventricles
Ventricles of brain and basal ganglia. Superior view. Horizontal section. Deep dissection
Ventricles of brain and basal ganglia. Superior view. Horizontal section. Deep dissection