descending pathways Flashcards
1
Q
where do LMNs exit the spinal cord?
A
the ventral roots
2
Q
what can LMNs lesions lead to?
A
muscle wasting muscle weakness hypotonia absent tendon reflexes fasciculations
3
Q
what is the function of UPNs?
A
influence LMN activity
modify local reflex activity
superimpose more complex patterns of movement
4
Q
where in the internal capsule do the descending corticosppinal fibres pass through?
A
the posterior limb - medial (gene) to lateral = face, arm, trunk, leg
5
Q
where does the descending pathway decussate?
A
the pyramids
6
Q
what is the function of the corticobulbar pathway?
A
influences LMNs in cranial nerve motor nuclei
7
Q
which nuclei do the LMN leave from?
A
the facial nuclei
8
Q
innervation of LMNs of corticobulbar pathway is bilateral - apart from
A
the hypoglossal
and the lower half of the facial - to the lower half of the face
