Dura Mater, Arachnoid Mater and Pia Mater

by Craig Canby, PhD

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    Now, let’s take a look at each of the three meningeal layers. The take home message here is for you to understand the basic characteristics of these meningeal layers. We’re going to start externally and work our way internally. So, that means we’ll look at the dura mater first and its characteristics. The dura mater is shown in green. In the cranial meningeal dura, the dura matter is going to be bilaminar. It will be a bilaminar, fibrous membrane. This is in contrast to the spinal dura mater which contains or is consisted of just one layer. Thus, it is unilaminar. So, if the cranial dura mater is bilaminar, what are the two layers that constitute the cranial dura mater? First is the outermost layer or the external most layer of the dura is going to be firmly attached to the inner part of the skull. That will be referred to as the periosteal layer. Then the internal or innermost lamina or layer of the dura will be the meningeal layer. These layers are fused with the exception of the dural venous sinuses where they will separate. That separation for example is shown here. This is the superior sagittal sinus. Right here attached to the inner part of the skull is the periosteal layer of the dura mater. Then this layer or lamina of the dura represents the meningeal layer. Another area where they are not fused is where you have infoldings. So here, we have an infolding of the meningeal layers from either side of the skull. They are diving deep into the fissure that separates the two cerebral hemispheres. There are other examples of these types of infoldings that we’ll explore. So, what are the dural infoldings or reflections? We’ll walk through a few of them. One of...

    About the Lecture

    The lecture Dura Mater, Arachnoid Mater and Pia Mater by Craig Canby, PhD is from the course Meninges. It contains the following chapters:

    • Characteristics of the Dura Mater
    • Characteristics of the Arachnoid Mater
    • Characteristics of the Pia Mater

    Included Quiz Questions

    1. Periosteal and meningeal layers are fused firmly with each other through entire length of dura mater.
    2. Cranial dura mater is bilaminar.
    3. Meningeal layer is the inner layer of cranial dura mater.
    4. Periosteal layer is attached to the skull.
    5. Spinal dura mater is Unilaminar.
    1. Dural venous sinuses
    2. Junction of pia mater and arachnoid mater
    3. Out pouching of the dura mater
    4. Suture lines
    5. Junction of dura and pia mater
    1. It is highly vascularized layer.
    2. It is thinner than dura mater.
    3. It is held against the inner dura by CSF pressure.
    4. Trabeculae extend from arachnoid mater into the subarachnoid space.
    5. It contains arachnoid granulations.
    1. Arachnoid granulations
    2. Confluence of sinuses
    3. Cisterns
    4. Choroid plexus
    5. Trabeculae
    1. It confers shiny appearance to the brain surface.
    2. It is responsible for absorption of CSF.
    3. It is responsible for the production of CSF.
    4. It is the thickest of all layers of Meninges.
    5. It is not directly adherent to the brain surface.

    Author of lecture Dura Mater, Arachnoid Mater and Pia Mater

     Craig Canby, PhD

    Craig Canby, PhD

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