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.
The occipital lobe is located at the lower central back of the brain. It is considered as the primary center for processing visual stimuli. This lobe is also involved in color and movement discrimination, and visuospatial processing. Any significant trauma at the back of the head can cause subtle changes in the visual-perception area.