The cerebellum lies behind the brain stem, against its dorsal surface, with the pons near its center. Although it makes up about 10 percent of the brain’s mass, its many connections and varied functions make it essential to the motor system.
The name pons means “bridge,” reflecting the large bundle of fibers that crosses from the pons to the opposite side of the cerebellum through the MCP.
All flashcards
What role does the cerebellum play in coordinating movement?
It compares copies of motor commands with sensory feedback and helps adjust movement in response.
What information travels through the middle cerebellar peduncle?
Input from the pons, including copies of cortical motor commands and information from other cortical areas.
What is the superior cerebellar peduncle’s main role?
It is the major cerebellar output route, carrying processed information toward the red nucleus and thalamus.
What do the spinocerebellum, vestibulocerebellum, and cerebrocerebellum contribute to?
They are associated, respectively, with proprioceptive input and posture, vestibular input and balance, and cortical connections and movement planning.
How is the cerebellum involved in procedural memory?
Cerebellar circuits contribute to learning and refining practiced motor skills, such as riding a bicycle.
Quiz questions
What does the check response assess during an elbow-resistance test?Answer: Whether a person can reduce excessive muscle contraction when resistance is removed.
During a finger-to-nose test, why might the examiner move the target?Answer: To assess accuracy and coordination as the person adjusts a directed movement.
What ability do rapid alternating movement tasks primarily examine?Answer: Smoothly switching and timing successive movement patterns.
How does the Romberg test differ from observing station with the eyes open?Answer: The person stands with eyes closed, testing how balance changes without visual input.
Why is reciting the alphabet backward not always a component of a Field Sobriety Test?Answer: Reversing the sequence involves cognition, although speaking also requires coordinated movements.
Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.