The Ball Grid Array, BGA, uses the underside of the package, where there is a considerable area for the connections. SMD BGA Ball Grid Array package diagram. The pins are placed in a grid pattern (hence the name Ball Grid Array) on the under-surface of the chip carrier.
* The cerebellum (infratentorial or back of brain) is located at the back of the head. Its function is to coordinate voluntary muscle movements, and to maintain posture, balance and equilibrium. The cerebellum also affects emotions and higher-level cognitive functions.
Headaches caused by hormonal problems due to changes in hormones are usually experienced in one side of the head. Headaches in the back of the head are normally due to mental tension, stress, improper posture, and depression. It is mostly the kind of pain that is sharp in the head that comes and goes.