A patient with head trauma shows prolonged inspiratory spasms followed by brief expirations (apneustic breathing). Which center is affected?

Apneustic breathing is characterized by prolonged inspiratory spasms followed by brief, insufficient expirations. This pattern occurs when the pneumotaxic center in the pons, which normally inhibits inspiration and allows for a smooth transition to expiration, is damaged or its connections are severed. This leaves the apneustic center unopposed, leading to prolonged inspiration.

Damage to the pneumotaxic center in the pons leads to apneustic breathing.

Answer: Pneumotaxic center in the pons (a)
a

Voluntary control over breathing, such as holding one's breath, involves higher brain centers that can override the automatic respiratory rhythm generated in the brainstem.

The cerebral cortex is responsible for conscious thought and voluntary motor control, including the ability to consciously control breathing patterns.

Answer: Cerebral cortex (d)
d

The ventral respiratory group (VRG) in the medulla is primarily involved in forced (active) inspiration and forced expiration. It contains both inspiratory and expiratory neurons that are activated during strenuous breathing. The dorsal respiratory group (DRG) is responsible for the basic rhythm of quiet inspiration.

Damage to the VRG would most likely impair the ability to perform forced breathing, both inspiration and expiration.

Answer: Forced expiration and inspiration (b)
b

Cheyne-Stokes breathing is an abnormal pattern of breathing characterized by a gradual increase in depth and sometimes rate, followed by a gradual decrease, and then a period of apnea (no breathing). This pattern is often associated with damage to higher brain centers, such as the cerebral cortex, which affects the sensitivity of the respiratory centers to carbon dioxide levels.

Traumatic brain injury leading to Cheyne-Stokes breathing indicates dysfunction in the central control of respiration, often involving the cerebral cortex.

Answer: Cerebral cortex (a)
a