Cranial chamber

A cranial chamber is a component of Transformer anatomy.

Fiction

The Transformers cartoon

Bombshell's cerebro-shell failed to latch onto Megatron who said that nobody tampered with his cranial vault. The Insecticon Syndrome

Prime cartoon

When the Autobots were trying to figure out how MECH built Nemesis Prime, Ratchet said that MECH disassembled Breakdown "from cranial chamber to heel strut". Nemesis Prime