Which meningeal layer is vascular

Outside the arachnoid is the dura. We'll add it to the picture. The dura is a much tougher layer of The dura is a much tougher layer of tissue than either the pia or the arachnoid. The dura has almost no attachment to the arachnoid. The dura can be separated from the overlying bone, but is normally quite closely attached to it. Now we'll add the rest of the dura to the picture. Here's the intact dura. These are branches of the middle meningeal artery, which runs in the thickness of the dura.

To look at the openings in the dura, we'll again look at it from the inside in an empty skull. The vessels and nerves that enter and leave the cranial cavity pass though openings in the dura. At each opening the dura forms a tunnel around the nerve or vessel for a short distance. Typically a nerve or blood vessel runs beneath the dura for a distance between its opening in the dura and its opening in the bone, so the openings in the dura often don't match the openings in the bone.

The difference between dural and bony openings is specially marked here in the middle cranial fossa. As we saw in the previous tape, the bone here has many openings.

By contrast the dura here has no openings. The corresponding openings in the dura are either up here, or back here. Avatar icon Avatar icon Sign In.

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Maingard, J. Blood supply of the meninges. Reference article, Radiopaedia. Central Nervous System. URL of Article. Blood supply Anterior cranial fossa meningeal branches of anterior ethmoidal artery posterior ethmoidal artery ophthalmic artery frontal branch of the middle meningeal artery which enters the middle cranial fossa via the foramen spinosum 2,3 Middle cranial fossa frontal and parietal branches of the middle meningeal artery accessory meningeal artery ascending pharyngeal artery branches directly from the internal carotid artery 2,3 The supratentorial dura mater is primarily supplied by the middle meningeal artery.

Head and Neuroanatomy. Read it at Google Books - Find it at Amazon 2.