The involuntary movements and sounds made by Terri Schiavo, such as eye movements and groans, were a result of her intact brainstem. While the areas of her brain controlling thought, sensation, and voluntary action were completely damaged, her medulla and pons continued to manage autonomic functions like breathing and generated these reflexive actions.

Physiological Basis of Terri Schiavo's Involuntary Actions

Deriving its name from the Latin word for 'bridge,' the pons is a hindbrain structure that connects the hindbrain with other brain regions. It also plays a role in managing brain activity levels during sleep.

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The parts of the hindbrain include:

- Medulla
- Pons
- Cerebellum

Parts of the Hindbrain

The brainstem is comprised of structures including the medulla, pons, and midbrain. It is responsible for regulating automatic bodily functions, such as breathing and blood pressure.

Brainstem

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

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Contained within the hindbrain, the medulla regulates the automatic processes of the autonomic nervous system, such as breathing, blood pressure, and heart rate. Along with the pons and other structures, it forms the brainstem, which spans both the midbrain and the hindbrain.

Medulla

Pons

The cerebellum, a hindbrain structure known as the 'little brain,' governs balance, coordination, and motor skills. It also plays a critical role in processing and storing implicit memories. This includes procedural memory for tasks, motor learning, and classical conditioning. Consequently, damage to the cerebellum can impair the ability to learn conditioned responses.

Cerebellum

A patient is brought to the emergency room after a fall. While their breathing and heart rate are stable, they are unable to walk in a straight line and have great difficulty performing coordinated actions like touching their finger to their nose. This loss of balance and motor coordination suggests damage to which part of the hindbrain?

Analyze the following clinical scenario and identify the most likely affected brain structure, explaining your reasoning.

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