Inhoudsopgave
Wat zijn Corticospinale banen?
De belangrijkste motorische baan van de hersenen is de pyramidebaan. Deze baan wordt ook wel de tractus corticospinalis lateralis genoemd. Deze baan begint in de primaire motore cortex. Van daaruit komen de axonen allemaal bij elkaar in de capsula interna.
Wat doen extra Piramidebanen?
Letterlijk betekent extrapiramidaal systeem: alle hersendelen buiten de piramidebaan. De piramidebaan is de route waarlangs vanuit de motorische hersenschors opdracht wordt gegeven om spieren te activeren, zodat een geplande beweging daadwerkelijk wordt uitgevoerd.
What are the corticospinal tracts?
The corticospinal tracts are the only direct pathway from the cerebral cortex to the LMNs in the brain stem and spinal cord. The corticospinal pathways are concerned with somatic movements, modifications of muscle tone, and segmental reflexes. There are three corticospinal tracts: lateral corticospinal, anterior corticospinal, and corticobulbar.
What is the decussation of the corticospinal tract?
Approximately ninety percent of the fibres in the corticospinal tract decussate, or intersect over to the opposite region of the brainstem, at the bottom surface of the pyramids in a package of axons, known as the pyramidal decussation.
Where do the axons of the anterior corticospinal tract decussate?
Most of the axons of the anterior corticospinal tract will decussate in the spinal cord just before they synapse with lower motor neurons. The fibers of these two different branches of the corticospinal tract preferentially stimulate activity in different types of muscles.
How does the descending corticospinal tract descend from the origin?
The descending corticospinal tract descends from the origin: Through the corona radiata Posterior half of lateral ventrical (lower limb represented by posterior fibres, face most anterior) Posterior limb of internal capsule (lower limb represented by posterior fibres, face most anterior)