Posterior perforated substance

The posterior perforated substance (PPS) is a layer of gray matter which is pierced by small apertures for the transmission of blood vessels. Its inferior part lies on the ventral aspect of the medial portions of the tegmenta and contains the interpeduncular nucleus; its superior part forms part of the floor of the third ventricle.

Posterior perforated substance
Coronal section of brain immediately in front of pons. (Post. perf. substance labeled at lower left.)
Details
Identifiers
Latin	substantia perforata posterior, substantia perforata interpeduncularis
NeuroNames	1580
Anatomical terms of neuroanatomy [edit on Wikidata]

The PPS is situated between the two cerebral peduncles in the midbrain. and posterior to the two mammillary bodies. It is perforated by the posteromedial central arteries – branches of the posterior cerebral arteries en route to the thalamus and basal ganglia.^[1]

See also

• Anterior perforated substance

Additional images

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  Human brainstem anterior view