  High resolution optical microscopy is essential in neuroscience but suffers
from scattering in biological tissues. It therefore grants access to
superficial layers only. Recently developed techniques use scattered photons
for imaging by exploiting angular correlations in transmitted light and could
potentially increase imaging depths. But those correlations (`angular memory
effect') are of very short range and, in theory, only present behind and not
inside scattering media. From measurements on neural tissues and complementary
simulations, we find that strong forward scattering in biological tissues can
enhance the memory effect range (and thus the possible field-of-view) by more
than an order of magnitude compared to isotropic scattering for $\sim$1\,mm
thick tissue layers.
