Which of the following vessels is involved in extradural haematoma?
**Core Concept**
An extradural hematoma (EDH) is a type of traumatic brain injury characterized by the accumulation of blood between the dura mater and the skull. The primary cause of EDH is the rupture of a blood vessel, leading to bleeding into this space. The anatomy of the cranium and the blood vessels within it plays a crucial role in the development of EDH.
**Why the Correct Answer is Right**
The middle meningeal artery is a branch of the maxillary artery that runs between the dura mater and the skull. It is the most common vessel involved in extradural hematoma, particularly in cases of temporal bone fractures. When the middle meningeal artery is damaged, it can lead to significant bleeding into the extradural space, resulting in an EDH. The vessel's location and its proximity to the dura mater make it susceptible to injury, leading to the characteristic clinical presentation of EDH.
**Why Each Wrong Option is Incorrect**
**Option B:** Venous sinuses are a network of blood vessels that drain deoxygenated blood from the brain. While they can be involved in various types of intracranial hemorrhages, they are not typically associated with extradural hematoma.
**Option C:** Bridging veins are blood vessels that connect the cerebral cortex to the dural sinuses. They are more commonly associated with subdural hematoma, another type of intracranial hemorrhage.
**Option D:** The middle cerebral artery is a major artery that supplies blood to the lateral surface of the brain. While it can be involved in intracranial hemorrhages, it is not typically associated with extradural hematoma.
**Clinical Pearl / High-Yield Fact**
In patients with extradural hematoma, it is essential to identify the source of bleeding and address it promptly to prevent further neurological deterioration. The middle meningeal artery is the most common source of bleeding in EDH, and its rupture is often associated with temporal bone fractures.
**✓ Correct Answer: A. Middle meningeal artery**