MTG deftly describes a classic witness who told the truth about the rear exit wound and was then gotten to...
Something seen many times in the Assassination...
MTG lies. Carrico NEVER described a rear exit wound.
MTG's claim:
"When Carrico testified before the WC four months later, in March 1964, he once again put the wound in the back of the head and also said there was shredded brain tissue in the back of the head:"
What Carrico testified to the WC:
"The wound that I saw was a large gaping wound, located in the right occipitoparietal area. I would estimate to be about 5 to 7 cm. in size, more or less circular, with avulsions of the calvarium and scalp tissue. As I stated before, I believe there was shredded macerated cerebral and cerebellar tissues both in the wounds and on the fragments of the skull attached to the dura."
This is exactly where he is locating the wound with his hand in this picture:

The definition of occipitoparietal area:
The occipitoparietal region is defined by the parieto-occipital sulcus, a deep groove that separates the parietal lobe’s precuneus from the occipital lobe’s cuneus. While a small portion of this sulcus is visible on the lateral surface of the cerebral hemisphere, its main part lies on the medial surface, running downward and forward to join the calcarine fissure. This places the region at the posterior and superior part of the brain, behind the central sulcus and above the lateral sulcus