is a network of neurons and nerve fibers. These nerves connect the brain and
body to play many functions. These neurons carry messages from brain and send
them to the body to perform a specific function. In return other neurons carry
messages from body to brain as output information.
is divided into two major divisions:
system is composed of brain and spinal cord.
enclosed into skull. Skull is a bony outer shell that protects the brain from
physical damage. Inside the skull, there is a protective tissues also called Meninges
which is further divide into three layers:
It is the outer
thickest layer of meninges. It contain cerebrospinal fluid.
It is the
middle layer of meninges and loosely attached to the pia matter by web like
fibers. It allows the movement of cerebrospinal fluid to provide protection and
nutrition to the brain cells.
It is the inner
most and delicate layer of meninges which is composed of connective tissues
that cover the brain and spinal cord. This layer holds the blood vessels and
provide nutrition and oxygen to the brain.
fluid is present in and around the brain that protects the brain from shock or
any physical brain injury. It provides the nutrition and oxygen to the brain
cells and also remove waste to and from the brain.
Brain has three
The table given
below shows the Subdivisions and principal structures of brain
Fore brain is
the main part of brain which is located on the top and front of the brain. It
is divided into two main subdivisions: