The locus coeruleus, black dot, the uppermost center of pigmentation is functionally the doorway that opens into the all black neuromelanin Amenta (original emphasis) nerve tract
. This infers it is literally a brain doorway to the collective unconscious which is that part of the human mind containing biological and mental records of ancestors accumulated phylogenetically.
Next, the investigators selectively modified specific sets of nerve cells in mice's brains so they could stimulate or inhibit signaling in these two nerve tracts
. Exclusively stimulating xiphoid activity markedly increased mice's propensity to freeze in place in the presence of a perceived aerial predator.
These nerve tracts
must be protected as much as possible; otherwise, permanent dysfunction could occur.
Under the microscope, these fascial tissues proved to be nerve tracts
running out of the falx cerebri with brain tissue attached to the free end.
There is the trigeminal nerve and the other nerve tracts
which are eudipleural in the myelencephalon.
While evidence exists of pain receptors appearing as early as five weeks after conception and the child responding to touch as early as week six, even those who hold out for the development of the whole fetal sensory system--pain receptors, nerve tracts
, spinal cord, thalamus, cortex--had to grant that all these were in place by the child's twentieth week of life.
Imaging, especially MRI with DWI and DTI, can help identify injury to the cord and specifically to the nerve tracts