A patient received a severe blow to the lateral side of the head, resulting in an epidural hematoma. Which of the following blood vessels was most likely torn?
**Core Concept**
Epidural hematoma is a type of traumatic brain injury characterized by bleeding between the skull and the dura mater, often due to a skull fracture or laceration of a blood vessel. The most common location for an epidural hematoma is the temporal region, which is supplied by the middle meningeal artery.
**Why the Correct Answer is Right**
The middle meningeal artery is a branch of the maxillary artery that runs along the inner surface of the skull, close to the dura mater. It is particularly vulnerable to injury from lateral head trauma, as it lies beneath the temporal bone. When the lateral side of the head is struck, the force can cause a tear in the middle meningeal artery, leading to bleeding into the epidural space. This type of injury is often associated with a "ping-pong ball" sign on CT scan, where the epidural hematoma expands and compresses the brain.
**Why Each Wrong Option is Incorrect**
**Option A:** The anterior cerebral artery is not typically associated with epidural hematomas. It is located deeper within the brain and is not as susceptible to injury from lateral head trauma.
**Option B:** The posterior cerebral artery is also not commonly involved in epidural hematomas. It is located near the brainstem and is not as exposed to the forces of lateral head trauma.
**Option C:** The internal carotid artery is a major artery that supplies the brain, but it is not typically associated with epidural hematomas. It is located deeper within the neck and is not as susceptible to injury from lateral head trauma.
**Clinical Pearl / High-Yield Fact**
In cases of epidural hematoma, it is essential to perform a thorough neurologic examination and imaging studies, such as CT or MRI, to evaluate the extent of the injury and plan appropriate treatment.
**Correct Answer: C. Middle meningeal artery.**