ARACHNOID GRANULATION Meaning and
Definition
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Arachnoid granulations are small protrusions of the arachnoid membrane, a delicate and thin layer of tissue that encases the brain and spinal cord. These granulations serve as a means of reabsorbing cerebrospinal fluid (CSF) from the subarachnoid space into the venous system.
The arachnoid granulations are typically found on the inner surface of the arachnoid membrane, immersed within the dural venous sinuses. These sinuses are large blood vessels that drain blood from the brain and eventually merge with the jugular veins. The granulations create small, finger-like projections that traverse through the dura mater and into the venous sinuses.
The role of arachnoid granulations is to facilitate the removal of excess CSF from the subarachnoid space. CSF is a clear fluid that surrounds the brain and spinal cord, providing protection and nutrients. However, when there is an imbalance between CSF production and absorption, it can lead to an accumulation of CSF, resulting in conditions such as hydrocephalus.
The arachnoid granulations act like valves, regulating the flow of CSF into the venous system. Through a process called bulk flow, CSF is absorbed by the granulations and is then transported into the venous sinuses. Once inside the veins, the CSF is eventually returned to the bloodstream, where it is reprocessed.
In summary, arachnoid granulations are small protrusions of the arachnoid membrane that function to reabsorb cerebrospinal fluid from the subarachnoid space into the venous sinuses for efficient drainage and maintenance of CSF balance in the brain.
Common Misspellings for ARACHNOID GRANULATION
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Etymology of ARACHNOID GRANULATION
The term "arachnoid granulation" is composed of two parts: "arachnoid" and "granulation".
1. "Arachnoid" originates from the Greek word "arachne", meaning "spider web". It refers to the arachnoid membrane, which is a delicate, web-like membrane in the brain that is one of the layers covering the brain and spinal cord.
2. "Granulation" comes from the Latin word "granulum", meaning "small grain or seed". It refers to small, rounded, or irregularly shaped masses or protuberances.
Therefore, "arachnoid granulation" is a term used in anatomy to describe small, grain-like projections or protuberances on the surface of the arachnoid membrane.
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