In Session The witness identifies a demonstrative aid showing the laceration to Savio’s head. “This outer layer, that’s skin . . . the scalp has a very distinct anatomy, with this thick layer of fat called the galea . . . and there here’s the bone. Beneath the bone is another thin membrane, the dura . . . beneath the dura is the subdural space.” A second demonstrative is then identified by the witness, and she points out in more detail the structure of the brain. “In Kathleen Savio’s case, the only damages was in the skin and a portion of the galea . . . there is no hemorrhage in Ms. Savio’s head, no trauma inside.” “Can you tell how much force would have been transmitted through the skull to the brain?” “You can’t predict that . . . only that the amount of force was dissipated before it went further.”.