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Topic

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Head of caudate nucleus

The head of the caudate nucleus is a prominent C-shaped subcortical gray matter structure, located anterolaterally to the lateral ventricle’s frontal horn. As the largest part of the caudate, it plays a crucial role in voluntary movement control, learning, and memory as part of the basal ganglia. It is also clinically significant due to its involvement in various neurodegenerative and vascular disorders, as well as its distinct appearance on neuroimaging modalities.

Anatomy

  • Largest and most anterior portion of the caudate nucleus.

  • Situated in the floor of the frontal horn of the lateral ventricle, lateral to the septum pellucidum.

  • Medially bordered by the lateral ventricle; laterally adjacent to the internal capsule.

  • Connects posteriorly with the body of the caudate nucleus.

Function

  • Integral part of the basal ganglia circuitry involved in regulation of voluntary movement.

  • Modulates motor processes and contributes to learning, habit formation, and cognitive functions.

  • Plays a role in procedural memory, associative learning, and reward systems.

  • Dysfunction is associated with Huntington’s disease, Parkinson’s disease, obsessive-compulsive disorder, and other neuropsychiatric conditions.

Arterial Supply

  • Primarily supplied by the recurrent artery of Heubner (medial striate artery), a branch of the anterior cerebral artery (ACA).

  • Additional supply from small perforating branches of the anterior cerebral artery and, to a lesser extent, the lenticulostriate arteries (branches of the middle cerebral artery).

Venous Drainage

  • Drained by small medullary veins, which empty into the internal cerebral veins.

  • Internal cerebral veins ultimately drain into the vein of Galen and then into the straight sinus.

MRI Appearance

  • T1-Weighted: Appears as intermediate (gray) signal intensity, similar to other deep gray matter structures.

  • T2-Weighted: Intermediate to slightly hyperintense signal relative to white matter.

  • FLAIR: Remains isointense to gray matter; pathological processes such as infarction or gliosis increase signal intensity.

CT Appearance

  • Appears as a well-defined slightly hyperintense gray matter structure lateral to the frontal horn of the lateral ventricle.

  • Hyperacute ischemia may show subtle hypoattenuation; chronic infarcts may present as volume loss or cavitation.

  • No enhancement is seen in the normal state.

MRI images

head of caudate nucleus mri 3t axial image

MRI images

head of caudate nucleus mri 3t coronal image