In brain death assessment, absence of cortical function is manifested by which of the following?

In brain death assessment, absence of cortical function is manifested by which of the following?

• A. Presence of spontaneous movement
• B. Lack of spontaneous motor activity, consciousness, and purposeful movement in response to painful stimuli
• C. Normal pupillary reflex to light
• D. Inability to elicit corneal reflex

Answer: (B)

The main idea is distinguishing cortical function from brainstem or spinal activity. Conscious awareness and intentional movement require cortical processing. If the cortex is nonfunctional, you would see no spontaneous movements, no conscious perception, and no purposeful response to painful stimuli. That combination is what the option describes, making it the best match for absence of cortical function. It’s important to note that spinal or brainstem reflexes can persist even when cortical function is lost, so signs like pupillary or corneal reflexes may still appear or disappear independently of cortical status.

The main idea is distinguishing cortical function from brainstem or spinal activity. Conscious awareness and intentional movement require cortical processing. If the cortex is nonfunctional, you would see no spontaneous movements, no conscious perception, and no purposeful response to painful stimuli. That combination is what the option describes, making it the best match for absence of cortical function. It’s important to note that spinal or brainstem reflexes can persist even when cortical function is lost, so signs like pupillary or corneal reflexes may still appear or disappear independently of cortical status.