Lecture 14 Flashcards
If the pontine reticulospinal is not controlled (brain stem lesion), what happens?
Hyperactivity = decerebrate rigidity = increase in the tone of extensors
What happens in a decorticate lesion (cortex lesion)?
Hyperactivity of flexors
What does the intermediate zone control?
Motion of distal portions of upper and lower limbs, especially the hands and feet
What does the vermis control?
Axial movements of the neck, shoulders, and hips
What does the lateral zone control?
Sequencing movements of the muscle.
What is the importance of the lateral zone?
Important for timing and coordination of movement
Where is the corticopontocerebellar pathway found?
Posterior lobe of the cerebellum
What is the function of the corticopontocerebellar pathway?
Command monitoring
Where does the corticopontocerebellar pathway project to?
The lateral hemispheric areas
What are the functions of the olivicerebellar (Inferior olive), vestibulocerebellar, and reticulocerebellar tracts?
Feedback and monitoring of commands
What are the afferent pathways from the brain to the cerebellum?
1) Corticopontocerebellar
2) Olivocerebellar
3) Vestibulocerebellar
4) Reticulocerebellar
What are the afferent pathways from the periphery to the cerebellum?
1) Dorsal spinocerebellar
2) Ventral spinocerebellar
Where does the dorsal spinocerebellar take its origin from?
1) Muscle spindle
2) Golgi tendon
3) Large tactile and joint receptors (Pacinian corpuscles) = ipsilatera
What is the function of the dorsal spinocerebellar?
1) Change in length and rate of change in length of limbs
2) Tension
Where does the ventral spinocerebellar take its origin from?
Alpha motor neuron
