Regarding the hyoid bone.. interesting article which i cannot copy and paste...
Mystery surrounds hyoid break in Epstein death
Warning, Grim reading...
The Hangman's Fracture - Dr Lindsey Fitzharris
"In the 20th century, death by hanging was intended to be quick. The drop and jerk were designed to dislocate the first two vertebrae in the neck, severing the spinal cord at that point. Because the nerves which control breathing are located beneath the 3rd, 4th and 5th vertebrae, air can no longer move in and out of the lungs. Death occurs within minutes.
In the 18th century, those who died on the scaffold were not as lucky. The time it took to die depended on several factors—the knot, the rope, the drop and the jerk—none of which had been perfected during this period. Thus, those who were hanged typically suffered slow, agonizing deaths as they gradually choked—their necks unbroken and their lungs still gasping for air. As long as the muscles in the neck stayed strong, a person could dangle at the end of a rope for upwards of thirty minutes before he or she died.
Even at that, death was not always guaranteed. Although it was rare, there were certainly instances of people being cut down from the gallows, only to miraculously resuscitate on the dissecting table. (Read more
here).
The hyoid bone (pictured below) is located inside the larynx, and sits at the base of the tongue. This delicate bone is the only one in the body which is not connected to another. Encased in muscles and ligaments, it is very well protected from breakage and injury. However, during strangulation or hanging, the hyoid snaps, resulting in ‘the hangman’s fracture’.
Hyoid bone
Sandra Bland's autopsy shows no signs of violent homicide, Texas prosecutor says
"The autopsy of Sandra Bland, whose death touched off a furor among activists after her body was found in a Texas jail cell, showed that her injuries were consistent with suicide and she did not have wounds indicating she was the victim of a violent homicide, officials said Thursday."
Using a PowerPoint presentation with graphic pictures, Diepraam walked through the findings, saying the physical evidence supported suicide and the lack of violent wounds argued against homicide.
For example, the hyoid bone in her neck — which often shatters in a violent homicide — was unbroken and intact. The ligature mark from the strangling was regular rather than irregular, as would have happened if Bland had been attacked, Diepraam said."
Boston Strangler Case Autopsy Stirs Debate
"When Albert DeSalvo confessed to killing the last
alleged victim of the Boston Strangler, he said he struck her over
the head to knock her out, and then strangled her.
But when forensic experts conducted an autopsy on Mary Sullivan’s body Saturday, they found no signs of trauma to her head, and her hyoid bone — a fragile neck bone typically snapped during strangulation — unbroken.
The families of Sullivan and DeSalvo hope these findings will help exonerate DeSalvo — 36 years after the murder was committed, and 27 years after his death."