Dr Gawad Physiology Course Online Exams – Cerebellum

The cerebellum is responsible for regulating muscle tone through gamma motor neurons. Gamma motor neurons are a type of motor neuron that innervate the muscle spindle, which is a sensory receptor in muscles that detects changes in muscle length and tension. By regulating the activity of gamma motor neurons, the cerebellum helps to maintain muscle tone and coordination. This allows for smooth and controlled movement.

The SPINOCEREBELLUM plays a crucial role in preventing overshooting of limbs during movement. It receives sensory information from the muscles and joints, allowing it to monitor the position and movement of the limbs. By continuously adjusting and fine-tuning muscle contractions, the spinocerebellum ensures that movements are precise and accurate, preventing overshooting or overextending the limbs. This helps to maintain control and coordination during voluntary movements, ensuring smooth and controlled actions.

Damping or stopping of movement refers to the process of reducing or controlling the oscillations or vibrations in a system. In the context of the given options, pendular movements are most closely related to damping. Pendular movements involve a back-and-forth swinging motion, similar to the movement of a pendulum. This type of movement naturally tends to dampen or decrease in amplitude over time due to the resistance or friction in the system. Therefore, pendular movements are associated with the concept of damping or stopping of movement.

The correct answer is "prevent decomposition of movement". This means that prediction of movements is related to the prevention of breaking down or separating the different components or parts of a movement. It suggests that being able to predict and anticipate the sequence and timing of movements can help in maintaining the smoothness and continuity of the overall movement, without any interruptions or disconnections.

The reticular formation is not involved in the Servocomparator function. The Servocomparator function is primarily related to motor control and coordination, and it relies on the dentato-thalamo cortical pathway, spinocerebellar tract, and corticospinal tract. The reticular formation, on the other hand, is responsible for regulating arousal and consciousness, as well as controlling certain reflexes. While it plays a crucial role in various brain functions, it is not directly involved in the Servocomparator function.

The statement "There is no body representation for the cerebrocerebellum" is false. The cerebrocerebellum, which includes the lateral hemispheres of the cerebellum, is involved in motor planning and coordination of skilled movements. It receives input from the cerebral cortex, including areas responsible for controlling body movements. Therefore, it does have a representation of the body, albeit not as specific or detailed as the vermis or spinocerebellum.