Dr McIlraith said she and her husband were supporting the neurosurgery campaign to raise $3 million for a Chair in Neurosurgery at the University of Otago.
Next month's Milford Track walk is one of the fundraising projects on the go.
Proceeds from the 50 tickets, each worth $2000, go to the campaign.
Dr McIlraith said she would be a "liability" on the Milford Track, after being badly injured two years ago when she fell off a horse. So she gave the tickets to her gymnasium personal trainer, Mr Fuller, who is studying physical education, and Mr Aspinall, who is studying computer science.
Prof Hammond-Tooke said that as a neurologist, he understood the importance of retaining neurosurgeons in Dunedin, because many of his patients needed their services.
Fundraising project manager Irene Mosley said nine tickets remained for the five-day Brain Week Walk, which will set out from Queenstown on March 21.
• Queenstown-based company Ultimate Hikes has raised at least $82,000 for the campaign after an offer last month to give the full price of the guided walk to the campaign.
Ultimate Hikes manager Noel Saxon said the company was conscious of the need to keep those services in Dunedin, and was "proud" to help: "It's an amazing walk, and this is an amazing cause."
