Substantia innominata

Substantia innominata

Infobox Brain
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Latin =
GraySubject = 189
GrayPage = 837


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MeshName = Substantia+innominata
MeshNumber = A08.186.211.577.820
DorlandsPre = s_27
DorlandsSuf = 12766814
The substantia innominata (literally "unnamed substance") of Meynert is a stratum consisting partly of gray and partly of white substance, which lies below the anterior part of the thalamus and lentiform nucleus. The gross anatomical structure is called anterior perforated substance because to the naked eye looks perforated by many holes. Holes are due to many blood vessels that pass through this area. It is part of the basal forebrain.

Layers

It consists of three layers, superior, middle, and inferior.

* The "superior layer" is named the ansa lentiformis, and its fibers, derived from the medullary lamina of the lentiform nucleus, pass medially to end in the thalamus and subthalamic region, while others are said to end in the tegmentum and red nucleus.

* The "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.

* The "inferior layer" forms the main part of the inferior stalk of the thalamus, and connects this body with the temporal lobe and the insula.

External links

* [http://mail.biocfarm.unibo.it/aunsnc/3dobjcl18.html Diagram at biocfarm.unibo.it]


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