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Cerebral laceration is a brain injury in which the pia-arachnoid is torn.
The arachnoid and pia are physically connected and thus often considered as a single layer, the pia-arachnoid.
Because the arachnoid is connected to the pia by cob-web like strands, it is structurally continuous with the pia, hence the name pia-arachnoid or leptomeninges.