Substantia innominata

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Parent item

White matter tracts

General

• Aka: Substantia innominata of Meynert

• An area of mixed grey and white matter

• Located within the anterior perforated substance in the basal forebrain.

• It contains the acetylcholine-rich basal nucleus of Meynert

Contains 3 layers

• Superior layer: Ansa lenticularis
• Origin: Medullary lamina of the lentiform nucleus,
• Courses: passes medially
• Terminate:
• Thalamus and subthalamic region
• Tegmentum and red nucleus

• Middle layer:
• Consists of nerve cells and nerve fibers
• Fibers enter it from the parietal lobe through the external capsule, while others are said to connect it with the medial longitudinal fasciculus.

• Inferior layer
• forms the main part of the inferior stalk of the thalamus, and connects this body with the temporal lobe and the insula.