An inertial measurement unit works by detecting the current rate of acceleration using one or more accelerometers, and detects changes in rotational attributes like pitch, roll and yaw using one or more gyroscopes. And some also include a magnetometer, mostly to assist calibration against orientation drift.
In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine.
They supply blood and nourishment to various organs in the head and the neck areas except the vagus nerve which has a different function. There are 12 cranial nerves and majority of them carry sensory fibers but some cranial nerves carry motor fibers as well and some carry both sensory and motor fibers.