Reps for Bret Michaels are revealing where the ailing rocker has been hospitalized, and the lead neurosurgeon treating him says, "Bret's sheer will to live and fully recover is undeniable."

Michaels, who suffered a brain hemorrhage last week, is being treated at the Barrow Neurological Institute -- one of the world's leading neurological centers, according to his reps -- at St. Joseph's Hospital and Medical Center in Phoenix, Arizona.

"In the days following Mr. Michaels' hospitalization, due to a subarachnoid hemorrhage, there was a lot of speculation as to where Mr. Michaels was being treated. Due to the severity of his life-threatening condition, the instantaneous way in which the hemorrhage presented itself, and [out of] respect for his family, his location was not confirmed to the media," Michaels' reps explain.

Meanwhile, the doctor heading up Michaels' medical team is revealing more information about the Poison frontman's health and mindset.

"There is no doubt that Mr. Michaels' condition is serious," says Dr. Zabramski, who has been a neurosurgeon at Barrow since 1986 and serves as the Chief of Cerebrovascular Surgery and Director of Clinical Neurosurgical Research at the center.

He continues: "Mr. Michaels will continue to undergo testing considering we have hit a few roadblocks including hyponatremia, severe cranial and back pain suffered from blood drainage, an emergency appendectomy performed a week earlier and a lifelong history of Type 1 Diabetes."

"Bret's sheer will to live and fully recover is undeniable," Dr. Zabramski adds. "He has an unbelievable fight in him and told me what kept him alive at the moment of the hemorrhage was that he did not want his family to wake up and see him lying unconscious in the middle of the floor.

"It was a combination of Bret's fight to stay conscious during the hemorrhage and get to the emergency room, and the immediate medical attention provided by our staff at Barrow, that enabled us to stabilize his condition."

Barrow neurologists and neurosurgeons will hold a press conference at 12 p.m. on Tuesday to update Michaels' condition, treatment and prognosis.

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