Pathologist Dr Marjorie Turner said all the bones on the left side of Khanokporn Satjawat's face were shattered.
The expert was giving evidence at the trial of Clive Carter, 35, from Motherwell, Lanarkshire, who denies murdering Miss Satjawat at the Clyde Auditorium, which is part of the SECC complex, on November 12 last year.
Dr Turner said: "There was bleeding into the skull. All the bones in the left side of her face were effectively shattered. The skull was broken into small pieces, which were forced into the brain. The base of her skull was fractured across from one ear to the other."
She said multiple blows had been inflicted, but was not able to say how many.
Dr Turner told the jury that Miss Satjawat, 42, had defensive injuries to her hands and may have been trying to defend herself. The pathologist was asked what force would have been needed to inflict the injuries and replied: "Because of the intensive injuries, it would require considerable force in the infliction of the blows."
The jury was shown photographs of the injuries inflicted on Miss Satjawar.
In a joint minute, which closed the Crown case, the jury was told Mr Carter's DNA was found on the sleeve of the jumper Miss Satjawat was wearing.
Mr Carter has admitted the culpable homicide of Miss Satjawat, 42, from Thailand, and has lodged a special defence of diminished responsibility.
Forensic scientist Josephine McKain told the High Court in Glasgow she found Miss Satjawat's blood on Mr Carter's trousers, and on the sleeve of his work blazer and cuffs of his shirt.
Miss McKain said the blood was "impact spatter", which was likely to have been caused by Miss Satjawat being struck while she was bleeding.
The scientist told the jury it was likely Miss Satjawat was lying down when she was struck.
Miss McKain also examined a fire extinguisher and found it had Miss Satjawat's blood on it and said it appeared attempts had been made to clean the blood off.
Dr Turner told the jury the cause of death was "blunt force trauma to the head."
She said Miss Satjawat, a delegate at an HIV conference, suffered massive bruising to the left hand side of her face, fractures to her jaw and damage to her teeth.
Earlier, the jury heard Mr Carter kept a photograph of a fire extinguisher on his home computer.
Stephen Kerr, a labourer at the SECC, said he was asked by police to identify a photograph found on Mr Carter's computer.
Mr Kerr, 34, told prosecutor John Scullion: "It was a fire extinguisher from the main building at the SECC."
The jury was shown other pictures taken from Mr Carter's computer that appeared to show him in uniform in gents' toilets, which were identified as being at the complex.
The trial before Lord Matthews continues.