The brain is a very important part of the human body as it
is the seat of intelligence, judgement, memory and all activities of the human
body are controlled by the brain. It is protected by three membranes, viz,
outer dura mater, middle arachnoid mater and inner pia mater. The space between
the arachnoid mater and pia mater is the subarachnoid space, filled with cerebrospinal
fluid. The cerebrospinal fluid is a very essential component as it acts like a
cushion for the brain, protecting it from various types of shocks, trauma and
during movements of the head and neck.
The main feature of arachnoid mater is the presence of
arachnoid villi, which are protrusions of arachnoid mater along with the
subarachnoid space through dura mater into the dural venous sinuses. These
arachnoid villi absorb the cerebrospinal fluid into the venous sinuses. As age
advances, the arachnoid villi enlarge to form arachnoid granulations, which may
erode the cranial bone, forming arachnoid pits. The arachnoid granulations may
be misinterpreted as venous sinus thrombosis or an extradural mass in MRI and
CT scans. Hence, normal and varied anatomy of arachnoid villi and arachnoid
granulations is of paramount importance. The chapter highlights the formation
of arachnoid villi and arachnoid granulations, their clinical implications,
along with a brief history.
Author(s) Details
Rajani Singh
Department of Anatomy, UP University of Medical Sciences, Saifai Etawah
206130, UP, India.
Please see the book here :- https://doi.org/10.9734/bpi/msup/v2/6646
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