fixed brain is embedded in celloidin and hundreds of
thin sections (25-40 microns thick) are sectioned sequentially
from the block like one would in slicing a sausage.
The brain specimens from which we have prepared serial
sections are arranged from front to back (rostral -
caudal) and are listed below. View the Atlas sections
from the specimen of your choice by clicking on the
section image next to each animal's name.
major aim of our Web Site is to allow anyone to find
out how the brains of mammals are constructed; what
the internal architecture of brains look like, and which
are the different groups of neurons that are responsible
for different functions such as behavioral, mental and
chimpanzee brain shown in the title above is pulled apart
at three different planes of section and the parts pulled
apart to reveal the stained sections at their interfaces.
collections of brain sections displayed for different
animals on this page are taken from different planes of
coronal section from the front to the back of each brain.
These sections are arranged as sets of images that have
been stained to reveal the internal arrangement of either
nerve cells or fiber tracts. These collections of brain
section pictures constitute what are called ATLASES.
Atlases are thus maps that reveal how their cell groups
and fiber tracts are arranged. An atlas of the chimpanzee
brain is like a guide book that shows how the chimp brain
is constructed. The pages of a brain atlas of a particular
animal represent the sections from the front to the back
of the brain of that animal. The text in a brain atlas
tells how the brain is constructed, what its different
parts are, and what the parts are called or named. Thus,
a brain atlas is a directory of the circuits of the brain.
It can be used by anyone who wishes to understand how
the brain is put together, and it helps us in understanding
where different brain functions are localized and distributed.
is important to note that the brains of all mammals have
the same basic brain parts, cell groups, fiber tracts,
and neural circuits. The same brain nuclei that can be
identified in rats and mice can also be found in the brains
of humans, horses and whales. Human brain atlases reveal
additional nuclei not found in other animals. Every animal
has brain nuclei that are differentially enlarged or diminished
from similar nuclei found in other animals.
of the brain atlases of different mammals can reveal features
that are unique or special to the different mammals, and
thus can help us understand how differences in neuroanatomical
construction of each mammal relate to functional expressions
that are also unique or specialized in that mammal.
atlases have been prepared for a variety of animals. Information
about these various brain atlases can be found at the
following Web sites: