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And a half centimeters of brain tissue. they were undergone three complex operations over the past five months to slowly separate them. today is the fourth and final stage. >> here is the model of our present set of twins. and we have -- this is anias on this side and this is jaden on this side. >> no one in the world has operated on more twins like jaden and anias than neurosurgeon dr. james goodrich. >> when you first met the mcdonalds, did you lay out any statistics? how did you approach it, was it a scientific discussion or emotional one? >> i said the goal ideally is to have both children...

Early yesterday morning. cnn has been given exclusive access to the mcdonald family's emotionally trying faith-testing journey. here's dr. sanjay gupta. >> how you doing? how are the guys? they look ready. >> reporter: 7:15 a.m. this is the day the mcdonalds have been waiting for for the last year. the hope that jaden and anias, 13 month old conjoined twins, will be separated at last. what were you thinking when we went down the hall this morning? what was going through your mind? >> it's not real. it's really not even real. to me it's like another surgery from before. >> are you talking to me...

Already, the boys will begin what's expected to be a 20-hour surgery to separate their shared brain tissue. dr. sanjay gupta joins me now on what is likely to be a remarkable day. hi, sanjay. >> carol, it is a remarkable day. this is one of the perks of the job. just next door is where this operation is happening. very few people get to see this. very new neurosurgeons get to see something like this. you mentioned it is so rare. dr. james goodrich is the lead neurosurgeon next door. he's widely considered one of the leading cranial neurosurgeons in the world. these are twins conjoined, connect...

Our senses help us perceive the world around us. a certain smell or sound can trigger some of our deepest memories. when it comes to hearing, the entire auditory system relies on tiny little hairs in your ears. they pick up the vibrations from your eardrum and convert them to nerve impulses. that's the message your brain receives. for more than 100 years, it was believed that brain tissue in this region was intended to process sound and sound only. that was until dr. laura began her work focusing not on sound and speech, but on language. and what she found was revolutionary. >> at first glance...

Trigger some of our deepest memories. when it comes to hearing, the entire auditory system relies on tiny little hairs in your ears. they pick up the vibrations from your eardrum and convert them to nerve impulses. that's the message your brain receives. interpreting the impulses as sound. for more than one h up years it was believed that brain tissue in this region was intended to process sound and sound only. that was until dr. laura began her work, focusing not on sound and speech but on language. and what she found was revolutionary. at first glance it might not look like much, but what th...