Concussion and contusion refer to

• A. Direct brain injuries.
• B. Indirect brain injuries.
• C. Injuries only from penetrating wounds.
• D. Injuries to the spinal cord.

Answer: (B)

The idea being tested is how brain injuries are categorized by mechanism. Concussion and contusion are injuries to the brain that come from head trauma. In this framing, they’re described as indirect brain injuries because the damage results from the forces transmitted to the brain inside the skull (like acceleration-deceleration or blunt impact) rather than from a direct, penetrating breach of brain tissue. Concussion is a temporary functional disturbance without a visible structural lesion, while contusion involves actual bruising of brain tissue. Injuries from penetrating wounds are classic direct brain injuries, and injuries to the spinal cord are a different category altogether.