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
Which tract is bilateral?
Ventral spinocerebellar
What does the ventral spinocerebellar tract do?
Transmits information on which signals have arrived at the spinal cord
What are the efferent pathways from the cerebellum?
1) Fastigioreticular tract
2) Interpositorubral tract
3) Dentatothalamocortical tract
Where do all of the efferent pathways go out from?
Deep cerebellar nuclei
Which tract goes out from the vermis?
Fastigioreticular tract
Which tract goes out from the intermediate zone?
Interpositorubral tract
Which tract goes out from the lateral zone?
Dentatothalamocortical tract
What is the function of the Interpositorubral tract?
Fine voluntary movements of distal muscles
What is the function of the Dentatothalamocortical tract?
Coordinates agonist and antagonist muscle contractions
What are the three neuronal layers of the cerebellar cortex?
1) Molecular cell layer
2) Purkinje cell layer
3) Granular cell layer
