finding lenght of each branch

Hi, I have a matrix as follows:

I =

     1     0     0     0     0     1
     1     0     0     0     1     0
     0     1     0     1     0     0
     0     0     1     0     0     0
     0     1     0     1     0     0
     1     0     0     0     1     1

I2=bwmorph(I,'branchpoints');

gives me the branchpoints. I need to find how many pixel are there in each branch. this is a sample matrix. I need a generalize one that can be used for any connected component having multiple branch points. can any body help? Thanks