Accessory meningeal artery

Accessory meningeal artery

Diagram of the arteries of the base of the skull, including the accessory meningeal artery.

The accessory meningeal artery is a small artery that supplies the dura mater of the brain. It is a branch of the maxillary artery, which is itself a major branch of the external carotid artery.

Anatomy

The accessory meningeal artery typically arises from the first part of the maxillary artery, although it can sometimes originate directly from the middle meningeal artery. It enters the cranial cavity through the foramen ovale, a passage in the sphenoid bone.

Once inside the cranial cavity, the accessory meningeal artery supplies the dura mater, the outermost of the three layers of the meninges that cover the brain and spinal cord. It may also supply small branches to the trigeminal ganglion and the cavernous sinus.

Variations

The presence and size of the accessory meningeal artery can vary significantly among individuals. In some cases, it may be absent, while in others, it may be quite prominent. Its course and connections with other arteries can also vary.

Clinical significance

The accessory meningeal artery is of clinical importance in certain surgical procedures involving the base of the skull. It may be encountered during surgeries for trigeminal neuralgia or other conditions affecting the trigeminal nerve.

In some cases, the accessory meningeal artery can be involved in epidural hematomas, which are collections of blood between the dura mater and the skull. Understanding its anatomy is crucial for neurosurgeons and radiologists.

Related pages

• Maxillary artery
• Middle meningeal artery
• Dura mater
• Foramen ovale

Gallery

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  Diagram of the arteries of the base of the skull, including the accessory meningeal artery.
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  Illustration showing the accessory meningeal artery.